Chicago, Indianapolis & Louisville 4-6-2 "Pacific" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class K-1 (Locobase 8284)

Data from CI&L 1 - 1940 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

These were the first of some relatively light Pacifics on the Monon. The firebox area is relatively small, but the piston valves measured 11". The valve gear lay inside.

They were soon superheated; see Locobase 8285.


Class K-1-A (Locobase 8285)

Data from CI&L 8 - 1941 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

The Monon's rebuild of their 16-year-old Pacifics (Locobase 8284) included more than the addition of the superheater. Cylinders were enlarged by 1/2 inch, piston valve diameter increased by an inch to 12", and the firebox gained some more area (probably in the form of arch tubes). K-2s (first purchased in 1906) were similarly retrofitted. See Locobase 8286.


Class K-2 (Locobase 8286)

Data from CI&L 1 - 1940 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

A couple of years after the K-1s (Locobase 8284) became the Monon's first Pacifics, this batch of Brooks arrived. Still smaller than the already relatively light K-1s, the class offered a little more power thanks to the slightly larger cylinders.

Like the K-1s, the K-2s were later superheated; see Locobase 8288


Class K-2-A (Locobase 8287)

Data from CI&L 8 - 1941 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Although the Monon's rebuild of their 1906 K-2s (Locobase 8286) had many similarities to that of the K-1-a (see Locobase 8284), the later engine's combustion chamber shortened tube length by two feet, thus reducing the evaporative and superheater surface areas. On the other hand, the increase in direct heating surface was undoubtedly of more value for power at speed, especially when the steam was allocated to the cylinders by 12" piston valves.

Retirements began in 1939 and continued until the end of steam on the railroad, which occurred in the late 1940s.


Class K-3 (Locobase 8288)

Data from CI&L 1 - 1940 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Brooks' relationship continued with this threesome of Pacifics. They were a little larger than the K-2s (Locobase 8286) and the grate area grew a little, but the biggest changes were in the cylinder volume (1/2" more diameter, 2" more stroke) which somewhat offset the drop in tractive effort occasioned by the increase in driver diameter; the inside Stephenson gear of the K-2 was replaced by Walschaert valve gear operated outside. Like the other early Monon Pacifics, these engines were later superheated. (See Locobase 8289)


Class K-3-A (Locobase 8289)

Data from CI&L 8 - 1941 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

As with the other Monon Pacifics, the big change in superheating the K-3's (Locobase 8288) original saturated-steam boiler consisted of removing small tubes in favor of 24 flues. Otherwise the engines remained as they had been.


Class K-4 (Locobase 8290)

Data from CI&L 1 - 1940 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Two years after delivering the trio of K-3 Pacifics that were themselves slight enlargements of earlier Monon 4-6-2s (Locobase 8288), Brooks produced a second set of three that were a bit larger in the boiler (30 more small tubes). Other than that difference, the batch was a repeat of the 1909 batch. Like the others, these were superheated in the 1920s (see Locobase 8291).


Class K-4-A (Locobase 8291)

Data from CI&L 8 - 1941 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

The rebuilds applied to this trio of locomotives first delivered in 1911 (see Locobase 8290) amounted to a bit more than the usual for the Monon. In addition to the usual substitution of flues for tubes (at the usual ratio), the railroad enlarged the cylinders by an inch. More important the firebox gained 43 sq ft more direct heating surface.

All were retired in 1947.


Class K-5 (Locobase 7603)

Data from reproduction of 1913 Alco Bulletin 1016 on Richard Leonard's http://www.railarchive.net/alcopacifics/index.html (accessed 16 June 2006). (Data from CI&L 8 - 1941 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection are used in the specifications; the Alco Bulletin showed 238 sq ft for the direct heating surface and a total of 2,502 sq ft for the evaporative surfaces.)

The first three of these superheated steamers came on the property in 1912, having formed a batch of 51674-51676 builder's numbers. The rest came later.

Direct heating surface shown in the Alco table includes 10 sq ft supplied by a lone arch tube. The boiler is relatively small and the tubes shortened by 3 feet of combustion chamber.

They were retired in 1948.


Class K-5-A (Locobase 8292)

Data from CI&L 8 - 1941 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Locobase 7603 shows the first three K-5s that were delivered in 1912. Eleven years later, Alco produced another trio to almost the same design. The builder took the opportunity to swap out a few more small tubes for 2 more flues, which led to the 40-sq-ft increase in superheater area. (The result still seems modest at 18.3%.)

They were retired in 1948.


Class K-6 (Locobase 5464)

Data from table in January 1917 issue of Railway Mechanical Engineer (RME). Additional data from CI&L 8 - 1941 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Not an especially big or powerful Pacific, this design had all the ratios of a free steamer as well as a more-than-adequate factor of adhesion. In fact, it was the first Monon engine to near the size of typical 4-6-2s in service on other Class 1 roads and its 14" piston valves contributed to the locomotive's good running qualities.

Brooks works numbers for 451 & 452 were 56395 and 56397, according to http://www.monon.org/steam2.html, a Monon steam roster website visited 17 June 2005. Locobase guesses that 450 may been works 56396.

The Monon (the Chicago, Indianapolis & Louisville) bought diesels early and the last of this trio went out of service in 1947.

Specifications by Steve Llanso of Sweat House Media
ClassK-1K-1-AK-2K-2-AK-3
Locobase ID8284 8285 8286 8287 8288
RailroadChicago, Indianapolis & Louisville (Monon)Chicago, Indianapolis & Louisville (Monon)Chicago, Indianapolis & Louisville (Monon)Chicago, Indianapolis & Louisville (Monon)Chicago, Indianapolis & Louisville (Monon)
CountryUSAUSAUSAUSAUSA
Whyte4-6-24-6-24-6-24-6-24-6-2
Number in Class44553
Road Numbers400-403400-403410-414410-414420-422
GaugeStdStdStdStdStd
Number Built4553
BuilderAlco-BrooksMononAlco-BrooksMononAlco-Brooks
Year19051921190619211909
Valve GearStephensonWalschaertWalschaertWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase12.33'12.33'12.33'12.33'12.83'
Engine Wheelbase31.67'31.67'31.67'31.67'32.92'
Ratio of driving wheelbase to overall engine wheebase 0.39 0.39 0.39 0.39 0.39
Overall Wheelbase (engine & tender)61.86'62.69'62.85'62.85'61.37'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers147000 lbs136000 lbs134000 lbs137000 lbs132000 lbs
Engine Weight203500 lbs223000 lbs219000 lbs222000 lbs205000 lbs
Tender Light Weight162000 lbs162000 lbs162000 lbs162000 lbs162000 lbs
Total Engine and Tender Weight365500 lbs385000 lbs381000 lbs384000 lbs367000 lbs
Tender Water Capacity7400 gals7400 gals7400 gals7400 gals7400 gals
Tender Fuel Capacity (oil/coal)18 tons18 tons18 tons18 tons18 tons
Minimum weight of rail (calculated)82 lb/yard76 lb/yard74 lb/yard76 lb/yard73 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter69"69"69"69"73"
Boiler Pressure200 psi200 psi200 psi200 psi200 psi
Cylinders (dia x stroke)21" x 26"21.5" x 26"21.5" x 26"21.5" x 26"22" x 28"
Tractive Effort28250 lbs29611 lbs29611 lbs29611 lbs31559 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.20 4.59 4.53 4.63 4.18
Heating Ability
Firebox Area160 sq. ft185 sq. ft207 sq. ft207 sq. ft212 sq. ft
Grate Area45 sq. ft45 sq. ft45 sq. ft45 sq. ft49 sq. ft
Evaporative Heating Surface2975 sq. ft2353 sq. ft2532 sq. ft2048 sq. ft2817 sq. ft
Superheating Surface517 sq. ft420 sq. ft
Combined Heating Surface2975 sq. ft2870 sq. ft2532 sq. ft2468 sq. ft2817 sq. ft
Evaporative Heating Surface/Cylinder Volume285.43215.38231.76187.46228.67
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation90009000900090009800
Same as above plus superheater percentage9000106209000105309800
Same as above but substitute firebox area for grate area3200043660414004843842400
Power L18330166977509144487658
Power MT374.79812.00370.62697.50383.70

Specifications by Steve Llanso of Sweat House Media
ClassK-3-AK-4K-4-AK-5K-5-A
Locobase ID8289 8290 8291 7603 8292
RailroadChicago, Indianapolis & Louisville (Monon)Chicago, Indianapolis & Louisville (Monon)Chicago, Indianapolis & Louisville (Monon)Chicago, Indianapolis & Louisville (Monon)Chicago, Indianapolis & Louisville (Monon)
CountryUSAUSAUSAUSAUSA
Whyte4-6-24-6-24-6-24-6-24-6-2
Number in Class33333
Road Numbers420-422430-432430-432440-442443-445
GaugeStdStdStdStdStd
Number Built333
BuilderMononAlco-BrooksMononAlco-BrooksAlco-Brooks
Year19211911192119121923
Valve GearWalschaertWalschaertWalschaertWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase12.83'12.83'12.83'12.83'12.83'
Engine Wheelbase32.92'32.92'32.92'32.92'33.58'
Ratio of driving wheelbase to overall engine wheebase 0.39 0.39 0.39 0.39 0.38
Overall Wheelbase (engine & tender)61.37'61.37'64.11'64.27'65.60'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers135000 lbs143500 lbs143500 lbs147500 lbs149000 lbs
Engine Weight209100 lbs219800 lbs219800 lbs227000 lbs237000 lbs
Tender Light Weight162000 lbs162000 lbs162000 lbs151000 lbs190000 lbs
Total Engine and Tender Weight371100 lbs381800 lbs381800 lbs378000 lbs427000 lbs
Tender Water Capacity7400 gals7400 gals7400 gals7000 gals9900 gals
Tender Fuel Capacity (oil/coal)18 tons18 tons18 tons15 tons17 tons
Minimum weight of rail (calculated)75 lb/yard80 lb/yard80 lb/yard82 lb/yard83 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter73"73"73"73"73"
Boiler Pressure200 psi200 psi200 psi185 psi200 psi
Cylinders (dia x stroke)22" x 28"22" x 28"23" x 28"23" x 28"23" x 28"
Tractive Effort31559 lbs31559 lbs34494 lbs31907 lbs34494 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.28 4.55 4.16 4.62 4.32
Heating Ability
Firebox Area212 sq. ft212 sq. ft255 sq. ft238 sq. ft255 sq. ft
Grate Area49 sq. ft49 sq. ft49 sq. ft48.80 sq. ft49 sq. ft
Evaporative Heating Surface2297 sq. ft3128 sq. ft2481 sq. ft2481 sq. ft2489 sq. ft
Superheating Surface468 sq. ft518 sq. ft518 sq. ft558 sq. ft
Combined Heating Surface2765 sq. ft3128 sq. ft2999 sq. ft2999 sq. ft3047 sq. ft
Evaporative Heating Surface/Cylinder Volume186.46253.91184.26184.26184.86
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation98009800980090289800
Same as above plus superheater percentage114669800114661056311564
Same as above but substitute firebox area for grate area4960842400596705151560180
Power L1149518272152131393015878
Power MT732.47381.25701.16624.62704.80

Specifications by Steve Llanso of Sweat House Media
ClassK-6
Locobase ID5464
RailroadChicago, Indianapolis & Louisville (Monon)
CountryUSA
Whyte4-6-2
Number in Class3
Road Numbers450-452
GaugeStd
Number Built3
BuilderAlco-Brooks
Year1916
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase13'
Engine Wheelbase34.50'
Ratio of driving wheelbase to overall engine wheebase 0.38
Overall Wheelbase (engine & tender)70.17'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers179000 lbs
Engine Weight285000 lbs
Tender Light Weight179500 lbs
Total Engine and Tender Weight464500 lbs
Tender Water Capacity9900 gals
Tender Fuel Capacity (oil/coal)13 tons
Minimum weight of rail (calculated)99 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter73"
Boiler Pressure190 psi
Cylinders (dia x stroke)26" x 28"
Tractive Effort41875 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.27
Heating Ability
Firebox Area255 sq. ft
Grate Area70 sq. ft
Evaporative Heating Surface4052 sq. ft
Superheating Surface880 sq. ft
Combined Heating Surface4932 sq. ft
Evaporative Heating Surface/Cylinder Volume235.50
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation13300
Same as above plus superheater percentage15694
Same as above but substitute firebox area for grate area57171
Power L117798
Power MT657.62

Reference


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