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US Railroad Administration Light Mikado
United States | 1918 | 625 produced
The Baltimore and Ohio Q3 No. 4500 was the first Light Mikado
The Baltimore and Ohio Q3 No. 4500 was the first Light Mikado

Since the 2-8-2 wheel arrangement had now become the US standard for lighter freight trains, the USRA designed the Light Mikado as the standard type for this purpose. It is considered the first USRA design to enter service. With cylinders measuring 26 by 30 inches and drivers with a diameter of 63 inches, sufficient pulling power was available for the lighter freight trains and a top speed of around 65 mph was achieved. The largest order came from the Baltimore & Ohio, which used a total of 100 as class Q-3. The Q-3 No. 4500 was the first USRA locomotive ever and is one of nine surviving Light Mikados.

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
Rigid wheelbase16 ft 9 in
Total wheelbase71 ft 4 in
Service weight290,800 lbs
Adhesive weight221,500 lbs
Total weight479,100 lbs
Water capacity10,000 us gal
Fuel capacity32,000 lbs (coal)
Boiler
Grate area66.7 sq ft
Firebox area280 sq ft
Tube heating area3,503 sq ft
Evaporative heating area3,783 sq ft
Superheater area882 sq ft
Total heating area4,665 sq ft
Power Plant
Driver diameter63 in
Boiler pressure200 psi
Expansion typesimple
Cylinderstwo, 26 x 30 in
Power
Power sourcesteam
Estimated power2,950 hp (2,200 kW)
Optimal speed34 mph
Starting effort54,724 lbf
Calculated Values
steam locomotive
freight
last changed: 07/2023
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