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US Railroad Administration 2-8-8-2 (Heavy Mallet)
United States | 1918 | 106 produced
The Virginian No. 900 was one of five machines that this railway did not want to take over and which were then sold to the Norfolk and Western
The Virginian No. 900 was one of five machines that this railway did not want to take over and which were then sold to the Norfolk and Western

The heaviest of the US Railroad Administration standard designs was a 2-8-8-2 wheel arrangement Mallet. It was strongly based on the Norfolk & Western class Y-2, which had found a good solution to the biggest problem of such large locomotives. While the amount of steam produced was normally no longer sufficient at speeds above 20 mph, the Norfolk & Western used smaller cylinders and a high boiler pressure of 240 psi for the first time.

A total of 106 examples were produced from the original USRA design, of which the Norfolk & Western accepted the most with 45 pieces and used them as class Y-3. Five of them were actually intended for the Virginian and were not accepted. Later, the Virginian took 20 more locomotives, and more went to the Baltimore & Ohio and the Clinchfield. A total of 116 copies were later made. Customers now also included the D&RGW, the Northern Pacific and the Interstate Railroad.

General
Built1918-1919
ManufacturerALCO, Baldwin
Axle config2-8-8-2 (Mikado Mallet) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase57 ft 4 in
Fixed wheelbase15 ft 6 in
Total wheelbase93 ft 3 in
Service weight531,000 lbs
Adhesive weight478,000 lbs
Total weight740,100 lbs
Water capacity12,000 us gal
Fuel capacity32,000 lbs (coal)
Power
Power sourcesteam
Estimated power4,300 hp (3,207 kW)
Optimal speed27 mph
Starting effort101,465 lbf
with start valve121,758 lbf
Power Plant
Driver diameter57 in
Boiler pressure240 psi
Expansion typecompound
Cylindersfour, HP: 25 x 32 in
and LP: 39 x 32 in
Boiler
Grate area96 sq ft
Firebox area435 sq ft
Tube heating area5,687 sq ft
Evaporative heating area6,122 sq ft
Superheater area1,475.5 sq ft
Total heating area7,597.5 sq ft
Calculated Values
steam locomotive
freight
Mallet
last changed: 07/2022
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