Baltimore & Ohio 2-8-8-4 Yellowstone Type Locomotives

Class EM-1 (Locobase 333)

Firebox heating surface included 211 sq ft of thermic syphons (5) and arch tubes. Lateral cushioning devices on each lead driver axle eased the locomotive into curves; the lead axle in the trailing truck also had one. Highly regarded engines that were the heaviest to be bought by the B&O. On the other hand, Drury (1993) says that "they were truly modern locomotives -- and they weren't what B&O wanted. The EM-1s probably wouldn't have been built but for the restrictions on diesels imposed by the War Production Board."

Last EM-1 retired in 1960.

Specifications
ClassEM-1
Locobase ID333
RailroadBaltimore & Ohio (B&O)
Whyte2-8-8-4
Road Numbers7600-7629
GaugeStd
BuilderBaldwin
Year1944
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase16.50'
Engine Wheelbase65.17'
Ratio of driving wheelbase to overall engine wheebase 0.25
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)62100 lbs
Weight on Drivers485000 lbs
Engine Weight628700 lbs
Tender Light Weight382000 lbs
Total Engine and Tender Weight1010700 lbs
Tender Water Capacity22000 gals
Tender Fuel Capacity (oil/coal)25 tons
Minimum weight per yard of rail on which locomotive could run101.04 lb rail
Geometry Relating to Tractive Effort
Driver Diameter64"
Boiler Pressure235 psi
Cylinders (dia x stroke)24" x 32" (4)
Tractive Effort115056 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.22
Heating Ability
Firebox Area756 sq. ft
Grate Area117.50 sq. ft
Evaporative Heating Surface5298
Superheating Surface2118
Combined Heating Surface7416
Evaporative Heating Surface/Cylinder Volume158.10
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation27612.50
Same as above plus superheater percentage35498.59
Same as above but substitute firebox area for grate area228399.47
Power L121049.51
Power MT765.46

Photos

Web Pages

Reference

Credits

Introduction and specifications provided by Steve Llanso of Sweat House Media.

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