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USRA Heavy Mikado 2-8-2 Steam Locomotive
The USRA Heavy Mikado was a USRA standard class of steam locomotive designed under the control of the United States Railroad Administration (USRA), 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.

Heavy Mikado 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.

List of Original USRA Allocation

Central Railroad of New Jersey
Quantity: 10
Class: M1s
Road numbers: 850–859
Notes: reclassified M63 in 1945.

Chicago, Burlington & Quincy Railroad
Quantity: 15
Class: O-4
Road numbers: 5500–5514
Notes: Several to Colorado and Southern Railway and Fort Worth and Denver Railroad.

Fort Worth and Denver Railway(CB&Q affiliate)
Quantity: 5
Class: E-4A2
Road numbers: 451–455

Chicago, Milwaukee, St. Paul and Pacific Railroad (Milwaukee Road)
Quantity: 100
Class: L3
Road numbers: 8600–8699
Notes: Renumbered 300–399 (not in order).

Chicago, St. Paul, Minneapolis and Omaha Railway (Omaha Road)
Quantity: 4
Class: J-2
Road numbers: 422–425

El Paso and Southwestern Railroad
Quantity: 5
Notes: to Great Northern Railway #3204–3208 in 1920.

Elgin, Joliet and Eastern Railway
Quantity: 5
Notes: to Western Pacific Railroad in 1920.

Erie Railroad
Quantity: 15
Class: N-2
Road numbers: 3200–3214

Great Northern Railway
Quantity: 4
Class: O-3
Road numbers: 3145–3148

Louisville and Nashville Railroad
Quantity: 20
Class: J4
Road numbers: 1750–1769

Pittsburgh and Lake Erie Railroad (New York Central Railroad subsidiary)
Quantity: 15
Class: H-9b, H-9d
Road numbers: 9505–9509, 9510–9519

Pittsburgh, McKeesport and Youghiogheny Railroad (New York Central Railroad subsidiary)
Quantity: 15
Class: H-9a, H-9c
Road numbers: 9580–9589, 9590–9594

Wheeling and Lake Erie Railway
Quantity: 20
Class: M-1
Road numbers: 6001–6020
Notes: to New York, Chicago and St. Louis Railroad (Nickel Plate Road) Nos. 671–690 in 1949.

Total: 233

Copies
List of copies

Central Railroad of New Jersey
Quantity: 56
Class: M2s, M2as, M3
Road numbers: 860–915
Notes: reclassified M63 in 1945

Chicago, St. Paul, Minneapolis and Omaha Railway (Omaha Road)
Quantity: 6
Class: J-2
Road numbers: 426–431

Chicago, St. Paul, Minneapolis and Omaha Railway (Omaha Road)
Quantity: 8
Class: J-3
Road numbers: 432–439

Louisville and Nashville Railroad
Quantity: 145
Class: J-4, J-4A
Road numbers: 1770–1914

Missouri Pacific Railroad
Quantity: 170
Class: MK-63
Road numbers: 1401–1570

St. Louis, Brownsville and Mexico Railway (MP subsidiary)
Quantity: 10
Class: MK-63
Road numbers: 1111–1120

St. Louis-San Francisco Railway
Quantity: 65
Class: 4100
Road numbers: 4100–4164

Southern Railway
Quantity: 115
Class: Ms-4
Road numbers: 4800–4915

Alabama Great Southern Railroad (Southern subsidiary)
Quantity: 8
Class: Ms-4
Road numbers: 6622–9929

Cincinnati, New Orleans and Texas Pacific Railroad (Southern subsidiary)
Quantity: 43
Class: Ms-4
Road numbers: 6320–6337, 6350–6374

West Point Route (Atlanta and West Point Rail Road)
Quantity: 1
Class: F
Road numbers: 430

West Point Route (Western Railway of Alabama)
Quantity: 1
Class: F
Road numbers: 380

Total: 724

None of the originals built under USRA auspices or any of the subsequent copies were preserved.

USRA Heavy Mikado Overview
Type and origin
Power type: Steam
Builder: ALCO, Baldwin, Lima
Build date: 1918–?
Total produced: 233 originals, plus 724 copies.
Specifications
Configuration: 2-8-2
UIC class: 1′D1′ h2
Driver diameter: 63 in (1,600 mm)
Locomotive Wheelbase: 36 ft 1 in (11.00 m)
Firebox:
 • Firegrate area: 70.8 sq ft (6.58 m2)
Boiler pressure: 190 lbf/in2 (1,300 kPa)
Cylinders: Two
Cylinder size: 27 in × 32 in (690 mm × 810 mm)
Valve gear: Walschaerts
Performance figures
Tractive effort: 60,000 lbf (270 kN)

See also:

2-8-2 Mikado

USRA Light Mikado

USRA Heavy Mikado diagram.

USRA Heavy Mikado diagram.

Classic Streamliners - TRAIN​CYCLOPEDIA

PRR Heavy Mikado No. 1752 as seen in Railway Mechanical Engineer, ca. 1916.

Wheeling & Lake Erie USRA Heavy Mikado No. 6001.

L&N Heavy Mikado No. 1752 as seen in Railway Mechanical Engineer, ca. 1916.

USRA Heavy Mikado.