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US Railroad Administration Heavy Mikado
United States | 1918 | 233 produced
No. 6001 on a works photo
No. 6001 on a works photo
Louisville & Nashville J4 No. 1780
Louisville & Nashville J4 No. 1780

In addition to the Light Mikado, the USRA standard designs also included the heavier variant, which basically had the same running gear. However, it received larger cylinders and a significantly heavier boiler. Although similarly sized Mikados were still being built without a stoker at the time, USRA locos had one as standard. The largest customer was Milwaukee Road, which took 100 units and designated them as Class L3. By 1922, a total of 233 original USRA standard design Heavy Mikados had been built. A further 724 copies were built by 1944, based directly on the design.

General
Built1918-1922
ManufacturerALCO, Baldwin, Lima
Axle config2-8-2 (Mikado) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase36 ft 1 in
Fixed wheelbase16 ft 9 in
Total wheelbase71 ft 8 1/2 in
Service weight325,000 lbs
Adhesive weight240,000 lbs
Total weight510,400 lbs
Water capacity10,000 us gal
Fuel capacity32,000 lbs (coal)
Power
Power sourcesteam
Estimated power3,100 hp (2,312 kW)
Optimal speed33 mph
Starting effort59,801 lbf
Power Plant
Driver diameter63 in
Boiler pressure190 psi
Expansion typesimple
Cylinderstwo, 27 x 32 in
Boiler
Grate area70.8 sq ft
Firebox area307 sq ft
Tube heating area3,986 sq ft
Evaporative heating area4,293 sq ft
Superheater area993 sq ft
Total heating area5,286 sq ft
Calculated Values
steam locomotive
freight
last changed: 07/2023
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