Mobile & Ohio 2-8-0 "Consolidation" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 540 (Locobase 5428)

Data on table in May 1916 issue of RME. (Southern's locomotive diagram 26-F-29, dated September 5, 1918 shows slightly different data for the heating surfaces:

54 sq ft for the grate

185 sq ft for the firebox heating surface

2,601 sq ft for the evaporative heating surface.) Also see DeGolyer, Vol 50, pp. 326+.

This was the sole set of Consolidations bought by the M & O while it was under the Southern's overall control. Eight of these came from Alco's Richmond plant and seven from Baldwin.

Drury (1993) comments that these were not popular with their crews: "The firebox, about the same size as that of the 2-8-2, required that the boiler be mounted higher to clear the rear drivers, and the rear pair of drivers tended to derail." Not only were no more 2-8-0s purchased, but 2/3 of those already owned were scrapped by 1940.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID5428
RailroadMobile & Ohio (GM&O)
Number in Class15
Road Numbers540-554
Number Built15
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)16.50 / 5.03
Engine Wheelbase (ft / m)25.08 / 7.64
Ratio of driving wheelbase to overall engine wheebase 0.66
Overall Wheelbase (engine & tender) (ft / m)61.50 / 18.77
Axle Loading (Maximum Weight per Axle) (lbs / kg)49,200 / 22,317
Weight on Drivers (lbs / kg)196,000 / 86,863
Engine Weight (lbs / kg)220,000 / 100,176
Tender Loaded Weight (lbs / kg)151,000 / 68,493
Total Engine and Tender Weight (lbs / kg)371,000 / 168,669
Tender Water Capacity (gals / ML)7500 / 28.41
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)12 / 10.90
Minimum weight of rail (calculated) (lb/yd / kg/m)82 / 41
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)63 / 1600
Boiler Pressure (psi / kPa)190 / 13.10
High Pressure Cylinders (dia x stroke) (in / mm)24" x 30" / 610x762
Tractive Effort (lbs / kg)44,297 / 20092.81
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.42
Heating Ability
Firebox Area (sq ft / m2)180 / 16.08
Grate Area (sq ft / m2)53.30 / 4.93
Evaporative Heating Surface (sq ft / m2)2579 / 238.66
Superheating Surface (sq ft / m2)557 / 50.74
Combined Heating Surface (sq ft / m2)3136 / 289.40
Evaporative Heating Surface/Cylinder Volume164.18
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation10,127
Same as above plus superheater percentage11,950
Same as above but substitute firebox area for grate area40,356
Power L110,785
Power MT485.24

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