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 Numbers10000
Number Built
Valve GearBaker
Locomotive Length and Weight
Driver Wheelbase15.50'
Engine Wheelbase57.33'
Ratio of driving wheelbase to overall engine wheebase 0.27
Overall Wheelbase (engine & tender)93.25'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers478000 lbs
Engine Weight531000 lbs
Tender Light Weight209100 lbs
Total Engine and Tender Weight740100 lbs
Tender Water Capacity12000 gals
Tender Fuel Capacity (oil/coal)16 tons
Minimum weight of rail (calculated)100 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter57"
Boiler Pressure240 psi
High Pressure Cylinders (dia x stroke)25" x 32"
Low Pressure Cylinders (dia x stroke)39" x 32" (2)
Tractive Effort101465 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.71
Heating Ability
Firebox Area435 sq. ft
Grate Area96 sq. ft
Evaporative Heating Surface6120 sq. ft
Superheating Surface1475 sq. ft
Combined Heating Surface7595 sq. ft
Evaporative Heating Surface/Cylinder Volume336.62
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation23040
Same as above plus superheater percentage27418
Same as above but substitute firebox area for grate area124236
Power L111116
Power MT410.15

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