United States Railroad Administration 2-8-8-2 "Chesapeake" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class Heavy (Locobase 330)

Data from tables in 1930 Locomotive Cyclopedia, "Standard 2-8-8-2 Type Locomotives," Railway Mechanical Engineer, Vol 93, No 4 (April 1919), pp. 187-190, and from American Locomotive Company, Standardized Locomotives, US Railroad Administration (Alco Pamphlet 10049, 1918), pp. 34-35, reprinted by (Ocean, NJ: Specialty Press , 1973), and DeGolyer, Vol 58, pp. 186+.

See also "Standard Equipment Specialties," Railway Mechanical Engineer, Vol 93, No 3 (March 1919), pp. 137-138 for a list of all the "special equipment" by manufacturers--everything from air brakes to lubricators to rolled steel wheels--and the USRA designs on which they appeared.

Standard design based on N&W Y-2 Mallet compound locomotive. Firebox heating surface included 85 sq ft (7.9 sq m) in the combustion chamber and 49 sq ft (4.55 sq m) in arch tubes. Cylinders were served by piston valves measuring 14" (356 mm) in diameter.

Unlike the light articulateds, these engines were considered a great success. Alco (20 at Richmond and 45 at Schenectady) and Baldwin (15) built 80 of these, including 50 for the N&W as the Y-3, 20 for the Virginian, and 10 for the Clinchfield Railroad.

Specifications by Steve Llanso of Sweat House Media
Locobase ID330
RailroadUnited States Railroad Administration (USRA)
Number in Class
Road Numbers10,000
Number Built
Valve GearBaker
Locomotive Length and Weight
Driver Wheelbase (ft)15.50
Engine Wheelbase (ft)57.33
Ratio of driving wheelbase to overall engine wheebase 0.27
Overall Wheelbase (engine & tender) (ft)93.25
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)478,000
Engine Weight (lbs)531,000
Tender Loaded Weight (lbs)209,100
Total Engine and Tender Weight (lbs)740,100
Tender Water Capacity (gals)12,000
Tender Fuel Capacity (oil/coal) (gals/tons)16
Minimum weight of rail (calculated) (lb/yd)100
Geometry Relating to Tractive Effort
Driver Diameter (in)57
Boiler Pressure (psi)240
High Pressure Cylinders (dia x stroke) (in)25" x 32"
Low Pressure Cylinders (dia x stroke) (in)39" x 32"
Tractive Effort (lbs)101,465
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.71
Heating Ability
Firebox Area (sq ft)435
Grate Area (sq ft)96
Evaporative Heating Surface (sq ft)6120
Superheating Surface (sq ft)1475
Combined Heating Surface (sq ft)7595
Evaporative Heating Surface/Cylinder Volume336.62
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation23,040
Same as above plus superheater percentage27,418
Same as above but substitute firebox area for grate area124,236
Power L111,116
Power MT410.15

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