Atlanta & West Point / Georgia Railroad 2-6-0 "Mogul" Locomotives in the USA


Class Details by Steve Llanso of Sweat House Media

Class B (Locobase 7318)

Data from A & WP-WRA 10 - 1945 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. Works number was 50957 in April 1912.

The only Mogul on the West Point Route was this one, used for freight transfer and switching in the Atlanta area.


Class B (Locobase 12603)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 24, p.200. Works numbers were 20050-20051 in February 1902.

This trio of Moguls continued the basic design of the 1900 Baldwins described in Locobase 12214. Boiler capacity increased with the introduction of 12 1/2 tubes. The firebox saw significant revisions that resulted in a longer, wider, and much shallower furnace with a 50% increase in grate area, but less direct heating surface. The long wheelbase of the earlier GRR 2-6-0s continued in this trio.

All three engines served the GRR until their retirements. 424 was scrapped first in 1923, 423 followed in 1929, and 425 completed the withdrawal with its scrapping in 1935.


Class B (Locobase 7900)

Data from GA Steam Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange; see also DeGolyer, Volume 26, pp. 120. Works numbers were 22873-22874 (road numbers 71-72) in September 1903, 23044-23045 (70, 73) in October, and 23634, 23656 (74-75) in January 1904.

The 1902 Baldwins shown in Locobase 12603 set the tone for this sextet of Moguls in the length of boiler tubes, approximately equal grate area. But the firebox had more area and the boiler more tubes, and the cylinders more volume. The class ran for decades unchanged - saturated boiler, medium-sized drivers, slide valves with a maximum travel of 5 1/2" (140 mm).

The driving axles were widely spaced with the firebox and the boiler riding above them. The later Georgia Railroad diagram showed an adhesion weight of 123,450 lb (59,996 kg), riding evenly with 41,150 lb (18,665 kg) loading each of the three axles, and the working engine weight reached 140,450 lb (63,707 kg).

Four of the six in the class were scrapped in 1935. 454-455 remained in service through World War II, then were scrapped in 1949.

Specifications by Steve Llanso of Sweat House Media
ClassBBB
Locobase ID7318 12,603 7900
RailroadAtlanta & West Point (WPR)Georgia Railroad (WPR)Georgia Railroad (WPR)
CountryUSAUSAUSA
Whyte2-6-02-6-02-6-0
Number in Class136
Road Numbers21038-39, 30 / 424-425, 42370-75/451-456
GaugeStdStdStd
Number Built136
BuilderAlco-RichmondBurnham, Williams & CoBurnham, Williams & Co
Year191219021903
Valve GearStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)11.50 / 3.5115.42 / 4.7015.42 / 4.70
Engine Wheelbase (ft / m)19.83 / 6.0423.50 / 7.1623.58 / 7.19
Ratio of driving wheelbase to overall engine wheebase 0.58 0.66 0.65
Overall Wheelbase (engine & tender) (ft / m)55.15 / 16.8152.58 / 16.03
Axle Loading (Maximum Weight per Axle) (lbs / kg)47,400 / 21,500
Weight on Drivers (lbs / kg)142,000 / 64,410104,000 / 47,174116,500 / 52,844
Engine Weight (lbs / kg)162,000 / 73,482125,000 / 56,699137,600 / 62,414
Tender Loaded Weight (lbs / kg)131,400 / 59,60285,000 / 38,555122,300 / 55,474
Total Engine and Tender Weight (lbs / kg)293,400 / 133,084210,000 / 95,254259,900 / 117,888
Tender Water Capacity (gals / ML)5000 / 18.944000 / 15.156000 / 22.73
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)8 / 7.3010 / 9.10
Minimum weight of rail (calculated) (lb/yd / kg/m)79 / 39.5058 / 2965 / 32.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)56 / 142260 / 152460 / 1524
Boiler Pressure (psi / kPa)200 / 13.80180 / 12.40180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)20" x 26" / 508x66019" x 26" / 483x66020" x 26" / 508x660
Tractive Effort (lbs / kg)31,571 / 14320.3823,934 / 10856.2926,520 / 12029.28
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.50 4.35 4.39
Heating Ability
Firebox Area (sq ft / m2)177 / 16.45137 / 12.73162.20 / 15.07
Grate Area (sq ft / m2)31.30 / 2.9128 / 2.6030.13 / 2.80
Evaporative Heating Surface (sq ft / m2)2042 / 189.781783 / 165.712253 / 209.31
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2042 / 189.781783 / 165.712253 / 209.31
Evaporative Heating Surface/Cylinder Volume216.00208.98238.32
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation626050405423
Same as above plus superheater percentage626050405423
Same as above but substitute firebox area for grate area35,40024,66029,196
Power L1577952075834
Power MT269.17331.14331.20

Reference