USRA Heavy Mikado

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USRA Heavy Mikado
USRA Heavy Mikado
Power type Steam
Builder ALCO, Baldwin, Lima
Build date 1918–?
Total production 233 originals, plus 724 copies[1]
Configuration 2-8-2
UIC classification 1'D1'
Driver size 63 in (1.60 m)[2]
Wheelbase 36 ft 1 in (11.00 m) (locomotive only)[2]
Boiler pressure 190 psi (1,300 kPa)[2]
Fire grate area 70.8 sq ft (6.58 m²)[2]
Cylinders 2[2]
Cylinder size 27 in (690 mm) bore × 32 in (810 mm) stroke[2]
Valve gear Walschaert[2]
Tractive effort 60,000 lb (27 kN)[2]
General arrangement drawing.
General arrangement drawing.

The USRA Heavy Mikado was a USRA standard class of steam locomotive designed under the control of the United States Railroad Administration, the nationalized railroad system in the United States during World War I. These locomotives were of 2-8-2 wheel arrangement in the Whyte notation, or 1'D1' in UIC classification. A total of 233 locomotives were built to this plan for the USRA; postwar, it became a de facto standard design, which was built to the total of 957 locomotives including the USRA originals and all subsequent copies.[2]

They used the same running gear as the USRA Light Mikado but were built to a higher axle load, larger cylinders and a much larger boiler for more power and steam-generating ability. Many aspects of the PRR L1s class were carried over to the Heavy Mikado, although not that locomotive's distinctive Belpaire firebox.[1]

Contents

[edit] Original owners[1]

[edit] USRA originals

[edit] Copies

[edit] References

  1. ^ a b c Westcott, Linn H. (1960). Model Railroader Cyclopedia volume 1 Steam Locomotives. Milwaukee, Wis.: Kalmbach Publishing Co.. ISBN 0890240019. 
  2. ^ a b c d e f g h i Huddleston, Eugene L. (2002). Uncle Sam's Locomotives: The USRA and the Nation's Railroads. Bloomington, Indiana: Indiana University Press. ISBN 0-253-34086-1. 
v • d • e
USRA locomotives
Switchers
Light
2-8-2 • 2-10-2 • 4-6-2 • 4-8-2
Heavy
2-8-2 • 2-10-2 • 4-6-2 • 4-8-2
Articulated
2-6-6-2 • 2-8-8-2