Canadian Pacific 4-6-2 Locomotives in Canada


Class Details by Steve Llanso of Sweat House Media

Class G1a, c, d (Locobase 4519)

Data from CP 1911-24 Locomotive Diagrams supplied in August 2013 by Allen Stanley from his extensive Rail Data Exchange; see also table in June 1907 issue of American Engineer & Railroad Journal (AERJ). The first seven CPR locomotives had works numbers: 1434-1436, 1483-1486 in 1906. The other 13 did not have works numbers.

A relatively small batch of tall-drivered Pacifics built over an four-year period by the Canadian Pacific and the Montreal Locomotive Works.

The boiler had a coned second course and the steam dome on the first course. As delivered, the class was fitted with the 22-element Vaughan-Horsey superheater, which is very similar in basic design to the much-better-known Schmidt smoke-tube design. The data in the specifications reflect that installation.

Beginning in the early 1920s, the CPR replaced the Vaughan-Horsey superheater with the more widely used Schmidt Type A in many of its early Pacifics. See Locobase 15762 for the update.


Class G1d (Locobase 15761)

Data from CP 1911-24 Locomotive Diagrams supplied in August 2013 by Allen Stanley from his extensive Rail Data Exchange. Works numbers were 49481-49487 in February 1911.

Continuing the class of small Pacifics, the CPR turned to MLW (now part of Alco) for another seven.


Class G1e/G1f (Locobase 15760)

Data from CP 1911-24 Locomotive Diagrams supplied in August 2013 by Allen Stanley from his extensive Rail Data Exchange;

The last of this class of 29 high-drivered, but relatively small and light Pacifics used cylinders measuring 1 1/2" (38 mm) more in diameter. The ten G1f were delivered in 1914.

All of the class was converted to Schmidt Type A superheaters in 1922-1927 and fell into G1u (ex-G1e) and G1v (ex-G1f) classes.


Class G1p-v Type A - 30 unit (Locobase 15762)

Data from 1947 Canadian Pacific Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. (Thanks to Chris Hohl, whose inquiries led to a review of the several G2 entries.)

This entry applies to those upgraded with the Schmidt Type A superheater. Unlike the upgraded Ten-wheelers, most Schmidt engines retained their 200-psi setting. Firebox heating surface for both versions included 24 sq ft (2.2 sq m) of arch tubes.

Almost all of the conversions used the 30-flue Type A installation shown in the specs. By 1927, eleven of the thirty-eight had exchanged their Vaughan & Horsey superheaters for these Type As. All but one was updated by 1947.

Two were fitted with a 28-tube Type A with 5 1/2" flues and 147 2 1/4" tubes.

Other sub-classes (likely a few in each) offered combinations such as 21 1/4"-diameter pistons and 225-psi boiler, 20"-diameter pistons and a 250-psi boiler, and in some cases, retention of the original 21"-diameter piston and 200-psi boiler. By the diagram book's 1947 publication date, all G1s and G2s then in service had been converted to the Schmidt superheater variant. A few had been fitted with Elesco feed water heaters.

For the original locomotives as delivered with Vaughan-Horsey superheaters, see Locobases 4519, 15760, and 15761 .

Similar in most respects to the G1s of the same span (1906-1914), this much larger class had 70" drivers. They were supplied by Alco-Schenectady, Canadian Pacific shops, and Montreal Loco Works and stayed in service until 1940-1961.


Class G2 b, c, d (Locobase 15763)

Data from CP 2 - 1947 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See Locobase 6556 for the original 1906 Vaughan-Horsey version of this Pacific.

As the G2's service career wore on, many of the locomotives were altered in one way or another. This entry shows the later version of the Vaughan & Horsey subtype fitted with larger-diameter tubes and pistons, but still using the 5" diameter flues. Firebox heating surface included 24 sq ft of arch tubes.


Class G2a, b, c (Locobase 6556)

Data from "Standardizing Locomotive Equipment - Canadian Pacific", American Engineer and Railroad Journal (May 1906), p. 161-165. Three delivered in 1906.

Locobase divides this class into several variants depending on the superheater and the cylinder volume. In the present entry, the class refers to the version using the Vaughan-Horsey superheater that was orginally installed when these engines were delivered in 1906-1907. They had 11" (279 mm) piston valves. Arch tubes added 16 sq ft to the firebox heating surface.

The principal difference between the Vaughan-Horsey and the Schmidt or Cole smoke-tube superheater was that the Vaughan-Horsey's superheater tubes were connected "separately and individually to the headers", as Vaughan put in his report to the 40th Annual Convention of the American Railway Master Mechanics' Association in 1906. (See pp. 286-287 for his comments on initial problems with the design.)

In later days, the tubes were shortened by 6" and most G2s had only 189 2" (15156) or 175 2 1/4" boiler tubes. (See Locobases 15156 and 10809, respectively.

For the Schmidt Type A variant, see Locobase 4518. Firebox heating surface for both versions included 24 sq ft (2.2 sq m) of arch tubes.

Similar in most respects to the G1s of the same span (1906-1914)--see Locobase 4518, et al,, this much larger class had 70" drivers. They were supplied by Alco-Schenectady, Canadian Pacific shops, and Montreal Loco Works.

They stayed in service until 1940-1961.


Class G2d - modified V&H (Locobase 15156)

Data from CP 2 - 1947 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See Locobase 6556 for the original 1906 Vaughan-Horsey version of this Pacific.

As the G2's service career wore on, many of the locomotives were altered in one way or another. This entry shows the later version of the Vaughan & Horsey subtype fitted with larger-diameter tubes and pistons, but still using the 5" diameter flues. Firebox heating surface included 24 sq ft of arch tubes.


Class G2e (Locobase 15765)

Data from CP 1911-24 Locomotive Diagrams supplied in August 2013 by Allen Stanley from his extensive Rail Data Exchange. CPR's own shops supplied 6 in 1911, 22 in 1912. Montreal Locomotve Works numbers were 52657-52686 in 1913.

Pacifics that followed the G2 pattern, but increased the cylinder diameter by 1 1/2" (38 mm) and changed the small tube layout in the boiler by substituting 18 2" tubes for 18 of the original 2 1/4". Thus, the boiler had the 175 2 1/4" tubes, 18 2" tubes, and 22 5" flues.

Beginning in the early 1920s, virtually all of this class was updated with Schmidt Type A superheaters; see Locobase 4518.


Class G2f - Vaughan-Horsey (Locobase 10809)

Data from CP 2 - 1947 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See Locobase 6556 for the original 1906 Vaughan-Horsey version of this Pacific.

As the G2's service career wore on, many of the locomotives were altered in one way or another. This entry shows twelve G2e of the Vaughan & Horsey subtype refitted with fewer tubes, larger-diameter flues, and more cylinder volume. Firebox heating surface included 24 sq ft (2.2 sq m) of arch tubes.

As of 1927, the G2f class included 2610, 2612-2616, 2622, 2625, 2627, 2630-2632, 2634, 2637, 2639-2641, 2643, 2645-2647, 2651-2656.

Almost all of these were later retrofitted with Schmidt Type A superheaters; see Locobase 4518.


Class G2p-u Type A - 20"" cylinders (Locobase 15766)

Data from 1947 Canadian Pacific Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

As the CPR replaced the now aging boilers on their large light Pacific class, Henry Bowen adopted a new combination of boiler and cylinder volume to achieve the same tractive effort.

By 1947, the following G2s had been rebuilt to this standard: 2504, 2510, 2521, 2523, 2525-2526, 2533-2534, 2539-2540, 2548, 2550, 2553-2556, 2558, 2564, 2572, 2575, 2580, 2582-2583, 2586, 2590, 2592-2595, 2597-2598, 2601, 2609-2611, 2617, 2622-2624, 2627, 2629, 2633-2634, 2644, 2655, 2565-2566.


Class G2p-u Type A-22 1/2"" cylinders (Locobase 4518)

Data from 1947 Canadian Pacific Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. (Thanks to Chris Hohl, whose inquiries led to a review of the several G2 entries.)

Locobase divides this class into two variants depending on the superheater that was added to the design some time after they were put in service in 1906-1914. This entry applies to those upgraded with the Schmidt Type A "Thru-bolt"superheater. Unlike the upgraded Ten-wheelers, most Schmidt engines retained their 200-psi setting. Firebox heating surface for both versions included 24 sq ft (2.25 sq m) of arch tubes.

Almost all of the conversions used the 30-flue Type A installation shown in the specs. Two were fitted with a 28-tube Type A TBolt header with 5 1/2" flues and 147 2 1/4" tubes.

Other sub-classes (likely a few in each) offered combinations such as 21 1/4"-diameter pistons and 225-psi boiler, 20"-diameter pistons and a 250-psi boiler (Locobase 15766), and in some cases, retention of the original 21"-diameter piston and 200-psi boiler. By the diagram book's 1947 publication date, all G1s and G2s then in service had been converted to the Schmidt superheater variant. A few had been fitted with Elesco feed water heaters.

For the Vaughan-Horsey variant, see Locobase 6556.

Similar in most respects to the G1s of the same span (1906-1914), this much larger class had 70" drivers. They were supplied by Alco-Schenectady, Canadian Pacific shops, and Montreal Loco Works and stayed in service until 1940-1961.


Class G3a/G3b/G3c (Locobase 2738)

Data from 1947 Canadian Pacific Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also F P Roesch, "Questions and Answers- 4911- Size of 23-- Class Pacific Type on Canadian Pacific Railway", Brotherhood of Locomotive Firemen and Enginemen's Magazine, Volume 71, No. 2 (15 July 1921), pp. 17-18; and William H. Winterrowd,"A Locomotive Designed for Rigorous Operating Conditions", Railway Review, Vol 68, No. 25 (18 June 1921), pp. 925-936.

First in a series of big, powerful Pacifics. The figure for number of engines in the class covers all versions of the G3. Winterrowd spells out all of the considerations behind this design in his Railway Review article.

A National Park Service Steamtown special history study on its G3c gives details on how these came to be produced:"William H. Winterrowd had become chief mechanical officer of the Canadian Pacific Railway (CPR) in April 1918 as the World War was winding down." The study describes the other types of locomotives Winterrowd developed, then notes:

"For passenger service, CPR needed heavier locomotives because "heavyweight" six-wheel truck all-steel cars had rapidly replaced the older, lighter wooden passenger cars on main line runs. Building on Vaughan's successful G-l and G-2 Pacifics manufactured well before the World War, Winterrowd's team produced plans for four G-3-a 4-6-2s with 75-inch drive wheels for service over relatively flat terrain and five G-4-a Pacifics with smaller 70-inch drivers [Locobase 4522] for main line service in hilly terrain. Numbered 2300 through 2303, one of the G-3-a locomotives appeared in July 1919 and the other three in August."

The firebox had a short combustion chamber and five arch tubes contributing to direct heating surface area. Fourteen-inch (356 mm) piston valves enjoyed 7" (179 mm) travel

After evaluating the relative performance of the two classes, Winterrowd concluded that the 75" driver was the appropriate size for the heavyweight expresses he wanted to pull. So a year later, CP's shops turned out five G-3b in August-September 1920 and another in January 1921. A year and a half later, the class went into series production with class G3c 2310-2318 appearing in June 1923 and 2320-2325 in July.

These all had Type A superheaters and Elesco feed water heaters. They would later trail larger tenders weighing 295,000 lb (133,810 kg) loaded with 14,400 US gallons (54,504 litres) of water and 21 long tons (23.2 short tons) of coal.

The G3d with nickel-steel boiler appears in Locobase 133, while later G3s with Type E superheaters are described in Locobases 5049 and 134.


Class G3d (Locobase 133)

Data from tables in 1930 Locomotive Cyclopedia and from 1947 Canadian Pacific Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. (Many thanks to Chris Hohl for his 22 September 2017 email reporting unlikely boiler pressure values for 177 entries. A Locobase macro caused the error .) Works numbers were 66764-66787 in August-October 1926.

Also had 28 2" tubes. G-3d firebox had combustion chamber and five arch tubes . A nickel-steel boiler allowed considerably higher boiler pressure (which led to a reduction in cylinder volume) and a reduction in the number of fire tubes. On balance, there was less total heating surface, but more of it was superheated.

3e, f, g, & h were later series with much more superheat surface; see Locobases 5049 and 134.


Class G3e/G3f (Locobase 5049)

Data from specifications published by CLC in 1945 and reproduced in [] (consulted in May 2002). The table depicts the G3e, as indicated by a reference to a 1938 order; G3fs were identical except for slightly higher weights. See also 1947 Canadian Pacific Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. Works numbers were 1944-1958 in October-November 1938 and 1970-1981 in April-June 1940.

These were the first of the "superpower" G3s with smaller cylinder diameter, higher BP, and a Type E superheater that resulted in a much higher percentage of dry steam. The firebox had 33 sq ft of thermic syphons.

They were designed by CPR Mechanical Superintendent Henry Bowen at a time when many other North American railroads were turning to 4-6-4 and 4-8-4 arrangements for their express passenger power.

A later sub-class is described on Locobase 134.


Class G3g/G3h/G3j (Locobase 134)

Data 1947 Canadian Pacific Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. (Many thanks to Chris Hohl for his 22 September 2017 email reporting unlikely boiler pressure values for 177 entries. A Locobase macro caused the error .) See Locobases 2738, 4522, and 5049 for earlier variants of the G3/G4 design.

Last G3 variant and the design that was produced in the greatest numbers. A shorter, obviously less crowded boiler had 14 fewer small tubes and 27 more flues that were 1/2" (12.7 mm) larger in diameter.

G3g 2378- 2417 CLC works #1982-2021 January 1942 - February 1943

G3h 2418-2462 CLC 2126-2170 August 1944 - April 1945

G3j 2463-3472 MLW 76116-76125 June 1948

This design pulled not only passenger, but also freight trains.


Class G4a/G4b (Locobase 4522)

Data from 1947 Canadian Pacific Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. William H. Winterrowd,"A Locomotive Designed for Rigorous Operating Conditions", Railway Review, Vol 68, No. 25 (18 June 1921), pp. 925-936. (Thanks to Chris Hohl for supplying the valve gear ID and tender capacities, and a question about dimensions that revealed some very odd numbers.)

These were the only G4s because WH Winterrowd, Chief Mechanical Engineer, compared their utility to the identical G3 class shown in Locobase 2738 and found that the latter's 75" drivers were more to his liking. So production of this 70" variant stopped at 18.

Firebox heating surface included 40 sq ft (3.7 sq m) of arch tubes and a short combustion chamber. Fourteen-inch (356 mm) piston valves served the cylinders.

The class could trail one of two tenders, either the 12,000 Imperial gallon(54,504 litres)/21 ton coal version or, for those G4s operating as oil burners, 8,000 ImpGal (36,336 litres) of water and 3,000 ImpGal (13,626 litres) of oil. According to Chris Hohl, the coal burners were 2708, 2710-2715 and the oil burners were road numbers 2700-2707, 2709, 2716-2717. 2711 was tested with smoke deflectors in 1941.

This satisfactory design carried on until 1954-1965.


Class G5 (Locobase 135)

Built for branch-line service as replacements for many older CPR engines. First 2 built by CPR at the Angus works; others by Montreal Locomotive Works and Canadian Locomotive Works. Plans called for as many as 600 to be procured, but only 102 were bought before dieselization curtailed the program. (Many thanks to Chris Hohl for his 22 September 2017 email reporting unlikely boiler pressure values for 177 entries. A Locobase macro caused the error .) CPR produced the first two in 1944. Montreal works numbers were 73719-73748 in 1945; 74892-74908, 74913-74915 in 1946. Canadian Locomotive Company works numbers were 2348-2367 in 1946 and 2429-2458 in 1948.

"They proved as fast and as efficient as they were handsome," says OS Nock (RWC VI, pl 33), " and 'saw steam out' on many secondary lines of the CPR."

A February 1954 article in Trains magazine by FH Howard, reproduced on [] (consulted in May 2002), agreed and provided many details on the class. Howard noted that the 1944 design had "scores of improvements", most notably a front-end throttle, roller bearings on the leading engine truck, and a Signal Foam Meter. Housing the throttle in the front allowed use of a dry pipe with slots along the underside, an arrangement "used", according to Howard, "for some years on this railroad instead of a steam dome".

Under the firebox was "probably the simplest trailing truck ever devised: not a truck at all, but an axle carried in the rigid frame with overwide pedestals set at a backward angle so when the axle moved laterally on curves, the journals were displaced longitudinally, giving truck action"

After successful trials in the East (1201) and West (1200), Montreal Locomotive Works delivered 30 G-5bs with mechanical stokers and Elesco exhaust steam injectors. 1946 saw 20 more from MLW and 20 from CLC and 1948 closed out the class with 30 from Canadian Loco.

(See Locobase 2413 for the very similar New South Wales C38. The two classes were designed separately for two very different railways, yet they have a striking resemblance)

Principal Dimensions by Steve Llanso of Sweat House Media
ClassG1a, c, dG1dG1e/G1fG1p-v Type A - 30 unitG2 b, c, d
Locobase ID4519 15761 15760 15762 15763
RailroadCanadian Pacific (CPR)Canadian Pacific (CPR)Canadian Pacific (CPR)Canadian Pacific (CPR)Canadian Pacific (CPR)
CountryCanadaCanadaCanadaCanadaCanada
Whyte4-6-24-6-24-6-24-6-24-6-2
Number in Class3971237100
Road Numbers1100-1119/1000-10191020-1026/2220-22262227-22382200-22381103-1202
GaugeStdStdStdStdStd
Number Built39712100
BuilderCPRMontrealCPRCPRseveral
Year19061906191319211906
Valve GearWalschaertWalschaertWalschaertWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)13 / 3.9613 / 3.9613 / 3.9613 / 3.9613 / 3.96
Engine Wheelbase (ft / m)33.58 / 10.2433.58 / 10.2433.58 / 10.2433.58 / 10.2433.58 / 10.24
Ratio of driving wheelbase to overall engine wheebase 0.39 0.39 0.39 0.39 0.39
Overall Wheelbase (engine & tender) (ft / m)60.17 / 18.3460.17 / 18.3459.83 / 18.3464.54 / 19.6760.08 / 18.31
Axle Loading (Maximum Weight per Axle) (lbs / kg)49,000 / 22,22649,000 / 22,22649,000 / 22,22648,000 / 21,772
Weight on Drivers (lbs / kg)140,000 / 63,503142,000 / 64,410142,000 / 63,503155,000 / 70,307141,000 / 63,957
Engine Weight (lbs / kg)216,000 / 97,976218,000 / 98,883219,000 / 97,976237,000 / 107,502215,000 / 97,522
Tender Loaded Weight (lbs / kg)131,000 / 59,421139,000 / 63,049139,000 / 59,421169,000 / 76,657131,000 / 59,421
Total Engine and Tender Weight (lbs / kg)347,000 / 157,397357,000 / 161,932358,000 / 157,397406,000 / 184,159346,000 / 156,943
Tender Water Capacity (gals / ML)6240 / 23.646240 / 23.646240 / 23.648400 / 31.828400 / 31.82
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)13.20 / 1213.20 / 1213.20 / 1212 / 1113.20 / 12
Minimum weight of rail (calculated) (lb/yd / kg/m)78 / 3979 / 39.5079 / 39.5086 / 4378 / 39
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)75 / 190575 / 190575 / 190575 / 177869 / 1753
Boiler Pressure (psi / kPa)200 / 13.80200 / 13.80200 / 13.80200 / 13.80200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)21" x 28" / 533x71121" x 28" / 533x71122.5" x 28" / 533x71122.5" x 28" / 572x71121" x 28" / 533x711
Tractive Effort (lbs / kg)27,989 / 12695.6127,989 / 12695.6132,130 / 14573.9432,130 / 14573.9430,423 / 13799.66
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.00 5.07 4.42 4.82 4.63
Heating Ability
Tubes (number - dia) (in / mm)193 - 2.25" / 57193 - 2.25" / 57175 - 2.25" / 57119 - 2.25" / 57193 - 2.25" / 57
Flues (number - dia) (in / mm)22 - 5" / 12722 - 5" / 12722 - 5.25" / 12730 - 5.5" / 14022 - 5" / 127
Flue/Tube length (ft / m)19.41 / 5.9219.41 / 5.9219.41 / 5.9219.41 / 5.9119.41 / 5.92
Firebox Area (sq ft / m2)175 / 16.26175 / 16.26175 / 16.26199 / 18.49175 / 16.26
Grate Area (sq ft / m2)45.60 / 4.2445.60 / 4.2445.60 / 4.2445.60 / 4.2445.60 / 4.24
Evaporative Heating Surface (sq ft / m2)2940 / 273.132940 / 273.132945 / 273.132610 / 242.572940 / 273.13
Superheating Surface (sq ft / m2)539 / 50.07539 / 50.07539 / 50.07675 / 62.73539 / 50.07
Combined Heating Surface (sq ft / m2)3479 / 323.203479 / 323.203484 / 323.203285 / 305.303479 / 323.20
Evaporative Heating Surface/Cylinder Volume262.03262.03228.47202.48262.03
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation91209120912091209120
Same as above plus superheater percentage10,48810,48810,48811,03510,488
Same as above but substitute firebox area for grate area40,25040,25040,25048,15840,250
Power L119,30919,30916,81718,77417,765
Power MT912.19899.35783.28801.09833.30

Principal Dimensions by Steve Llanso of Sweat House Media
ClassG2a, b, cG2d - modified V&HG2eG2f - Vaughan-HorseyG2p-u Type A - 20"" cylinders
Locobase ID6556 15156 15765 10809 15766
RailroadCanadian Pacific (CPR)Canadian Pacific (CPR)Canadian Pacific (CPR)Canadian Pacific (CPR)Canadian Pacific (CPR)
CountryCanadaCanadaCanadaCanadaCanada
Whyte4-6-24-6-24-6-24-6-24-6-2
Number in Class2863582747
Road Numbers1150-1177/1100-11271180-12421203-12602610+2504+
GaugeStdStdStdStdStd
Number Built2858
BuilderseveralCPRseveralCPRCPR
Year19061945191119121941
Valve GearWalschaertWalschaertStephensonWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)13 / 3.9613 / 3.9613 / 3.9613 / 3.9613 / 3.96
Engine Wheelbase (ft / m)33.58 / 10.2433.58 / 10.2433.58 / 10.2433.58 / 10.2433.58 / 10.24
Ratio of driving wheelbase to overall engine wheebase 0.39 0.39 0.39 0.39 0.39
Overall Wheelbase (engine & tender) (ft / m)59.96 / 18.2860.08 / 18.3160.17 / 18.3464.54 / 19.6764.54 / 19.67
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)139,300 / 63,185155,000 / 70,307141,000 / 63,957155,000 / 70,307156,000 / 70,307
Engine Weight (lbs / kg)214,300 / 97,205237,000 / 107,502217,000 / 98,430237,000 / 107,502241,000 / 107,502
Tender Loaded Weight (lbs / kg)122,700 / 55,656169,000 / 76,657139,000 / 63,049169,000 / 76,657238,000 / 76,657
Total Engine and Tender Weight (lbs / kg)337,000 / 152,861406,000 / 184,159356,000 / 161,479406,000 / 184,159479,000 / 184,159
Tender Water Capacity (gals / ML)5000 / 18.948400 / 31.826240 / 23.647000 / 26.5212,000 / 31.82
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)10 / 913.20 / 1213.20 / 1212 / 1119.80 / 11
Minimum weight of rail (calculated) (lb/yd / kg/m)77 / 38.5086 / 4378 / 3986 / 4387 / 43.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)70 / 177869 / 175369 / 175370 / 177870 / 1778
Boiler Pressure (psi / kPa)200 / 13.80200 / 13.80200 / 13.80200 / 13.80250 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)21" x 28" / 533x71122.5" x 28" / 533x71122.5" x 28" / 572x71122.25" x 28" / 565x71120" x 28" / 572x711
Tractive Effort (lbs / kg)29,988 / 13602.3434,924 / 15841.2834,924 / 15841.2833,664 / 15269.7534,000 / 15422.16
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.65 4.44 4.04 4.60 4.59
Heating Ability
Tubes (number - dia) (in / mm)209 - 2.25" / 57189 - 2.25" / 57175 - 2.25" / 57175 - 2.25" / 57119 - 2.25" / 57
Flues (number - dia) (in / mm)22 - 5" / 12722 - 5" / 12722 - 5" / 12722 - 5.25" / 13330 - 5.5" / 140
Flue/Tube length (ft / m)20 / 6.1019.41 / 5.9219.41 / 5.9219.50 / 5.9419.40 / 5.91
Firebox Area (sq ft / m2)191 / 17.75199 / 18.49175 / 16.26199 / 18.49199 / 18.49
Grate Area (sq ft / m2)48 / 4.4645.60 / 4.2445.60 / 4.2445.60 / 4.2445.60 / 4.24
Evaporative Heating Surface (sq ft / m2)3122 / 290.152914 / 270.722945 / 273.602926 / 271.832610 / 242.57
Superheating Surface (sq ft / m2)530 / 49.26433 / 40.23539 / 50.07433 / 40.23675 / 62.73
Combined Heating Surface (sq ft / m2)3652 / 339.413347 / 310.953484 / 323.673359 / 312.063285 / 305.30
Evaporative Heating Surface/Cylinder Volume278.25226.07228.47232.22256.39
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation960091209120912011,400
Same as above plus superheater percentage11,04010,30610,48810,30613,794
Same as above but substitute firebox area for grate area43,93044,97440,25044,97460,198
Power L118,39813,92815,47214,47827,734
Power MT873.52594.31725.74617.781175.83

Principal Dimensions by Steve Llanso of Sweat House Media
ClassG2p-u Type A-22 1/2"" cylindersG3a/G3b/G3cG3dG3e/G3fG3g/G3h/G3j
Locobase ID4518 2738 133 5049 134
RailroadCanadian Pacific (CPR)Canadian Pacific (CPR)Canadian Pacific (CPR)Canadian Pacific (CPR)Canadian Pacific (CPR)
CountryCanadaCanadaCanadaCanadaCanada
Whyte4-6-24-6-24-6-24-6-24-6-2
Number in Class6526252793
Road Numbers2503+2300-23252326-23502351-23772378-2472
GaugeStdStdStdStdStd
Number Built26252793
BuilderCPRAngus WorksMontreal LWCanadian Locomotive Coseveral
Year19211919192619381942
Valve GearWalschaertWalschaertWalschaertWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)13 / 3.9613.17 / 4.0113.17 / 4.0113.17 / 4.0113.17 / 4.01
Engine Wheelbase (ft / m)33.58 / 10.2434.50 / 10.5235 / 10.6735 / 10.6735 / 10.67
Ratio of driving wheelbase to overall engine wheebase 0.39 0.38 0.38 0.38 0.38
Overall Wheelbase (engine & tender) (ft / m)64.54 / 19.6767.83 / 20.6773.81 / 22.5075.62 / 23.05
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)155,000 / 70,307181,500 / 82,327183,900 / 83,416198,000 / 89,811199,600 / 90,537
Engine Weight (lbs / kg)237,000 / 107,502299,000 / 135,624306,500 / 139,026321,000 / 145,603323,000 / 146,511
Tender Loaded Weight (lbs / kg)169,000 / 76,657178,000 / 80,740238,000 / 107,955222,000 / 100,698196,760
Total Engine and Tender Weight (lbs / kg)406,000 / 184,159477,000 / 216,364544,500 / 246,981543,000 / 246,301519,760
Tender Water Capacity (gals / ML)8400 / 31.829600 / 36.369500 / 35.9812,000 / 45.4512,000 / 45.45
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)12 / 1112 / 1112 / 1118 / 1618 / 16
Minimum weight of rail (calculated) (lb/yd / kg/m)86 / 43101 / 50.50102 / 51110 / 55111 / 55.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)70 / 177875 / 190575 / 190575 / 190575 / 1905
Boiler Pressure (psi / kPa)200 / 13.80200 / 13.80250 / 17.20275 / 19275 / 19
High Pressure Cylinders (dia x stroke) (in / mm)22.5" x 28" / 572x71125" x 30" / 635x76223" x 30" / 584x76222" x 30" / 559x76222" x 30" / 559x762
Tractive Effort (lbs / kg)34,425 / 15614.9442,500 / 19277.7044,965 / 20395.8145,254 / 20526.8945,254 / 20526.89
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.50 4.27 4.09 4.38 4.41
Heating Ability
Tubes (number - dia) (in / mm)119 - 2.25" / 57205 - 2.25" / 57160 - 2.25" / 5744 - 2.25" / 5730 - 2.25" / 57
Flues (number - dia) (in / mm)30 - 5.5" / 14038 - 5.5" / 14040 - 5.5" / 140167 - 3.5" / 89140 - 4" / 102
Flue/Tube length (ft / m)19.40 / 5.9118.41 / 5.6118 / 5.4918 / 5.4917.67 / 5.39
Firebox Area (sq ft / m2)199 / 18.49297.60 / 27.65291 / 27.04291 / 27.04291 / 27.04
Grate Area (sq ft / m2)45.60 / 4.2465 / 6.0465 / 6.0465 / 6.0465 / 6.04
Evaporative Heating Surface (sq ft / m2)2610 / 242.573530 / 327.953272 / 304.093497 / 3253176 / 295.17
Superheating Surface (sq ft / m2)675 / 62.73803 / 74.60864 / 80.301473 / 136.901475 / 137.08
Combined Heating Surface (sq ft / m2)3285 / 305.304333 / 402.554136 / 384.394970 / 461.904651 / 432.25
Evaporative Heating Surface/Cylinder Volume202.48207.16226.75264.92240.61
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation912013,00016,25017,87517,875
Same as above plus superheater percentage11,03515,47019,66323,23823,595
Same as above but substitute firebox area for grate area48,15870,82988,028104,033105,633
Power L117,52317,96527,07747,41946,630
Power MT747.71654.64973.811583.951545.11

Principal Dimensions by Steve Llanso of Sweat House Media
ClassG4a/G4bG5
Locobase ID4522 135
RailroadCanadian Pacific (CPR)Canadian Pacific (CPR)
CountryCanadaCanada
Whyte4-6-24-6-2
Number in Class18102
Road Numbers2700-27171200-1301
GaugeStdStd
Number Built18102
BuilderCanadian PacificSeveral
Year19191944
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.17 / 4.0113 / 3.96
Engine Wheelbase (ft / m)34.74 / 10.5933.71 / 10.27
Ratio of driving wheelbase to overall engine wheebase 0.38 0.39
Overall Wheelbase (engine & tender) (ft / m)67.09 / 20.45
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)193,000 / 87,543151,000 / 68,493
Engine Weight (lbs / kg)318,000 / 144,243229,500 / 104,100
Tender Loaded Weight (lbs / kg)295,000 / 133,810191,000 / 86,636
Total Engine and Tender Weight (lbs / kg)613,000 / 278,053420,500 / 190,736
Tender Water Capacity (gals / ML)14,388 / 54.509600 / 36.36
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)21 / 1914 / 13
Minimum weight of rail (calculated) (lb/yd / kg/m)107 / 53.5084 / 42
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)70 / 177870 / 1778
Boiler Pressure (psi / kPa)205 / 14250 / 17.20
High Pressure Cylinders (dia x stroke) (in / mm)24.5" x 30" / 622x76220" x 28" / 508x711
Tractive Effort (lbs / kg)44,826 / 20332.7634,000 / 15422.16
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.31 4.44
Heating Ability
Tubes (number - dia) (in / mm)205 - 2.25" / 57111 - 2.25" / 57
Flues (number - dia) (in / mm)38 - 5.5" / 14032 - 5.5" / 140
Flue/Tube length (ft / m)18.41 / 619.67 / 6
Firebox Area (sq ft / m2)298 / 27.70199 / 18.49
Grate Area (sq ft / m2)65 / 6.0445.60 / 4.24
Evaporative Heating Surface (sq ft / m2)3530 / 328.072576 / 239.41
Superheating Surface (sq ft / m2)803 / 74.63744 / 69.14
Combined Heating Surface (sq ft / m2)4333 / 402.703320 / 308.55
Evaporative Heating Surface/Cylinder Volume215.64253.05
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation13,32511,400
Same as above plus superheater percentage15,85713,908
Same as above but substitute firebox area for grate area72,69760,695
Power L117,89329,416
Power MT613.171288.43

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