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Seaboard Air Line class Q-3
United States | 1923
118 produced

After the Seaboard Air Line had already put ten USRA Light Mikados into service as the class Q-1, a total of 117 copies were built as the Q-3 from 1923 onwards. They differed from the USRA locomotives primarily in the firebox and had a longer wheelbase between the leading axle and the first driver. They also had a mechanical stoker and a booster on the trailing axle. After the 117 locomotives had been built by ALCO and Baldwin by 1926, the SAL manufactured number 451 in its own workshops in 1930. This was created from the frame of the 441, which had fallen victim to a boiler explosion. The last Q-3 disappeared in 1955.

General
Built1923-1926, 1931
ManufacturerALCO, Baldwin, SAL
Axle config2-8-2 (Mikado)
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase37 ft 10 in
Rigid wheelbase16 ft 9 in
Total wheelbase74 ft 10 1/2 in
Service weight300,000 lbs
Adhesive weight212,000 lbs
Total weight490,600 lbs
Axle load53,000 lbs
Water capacity9,600 us gal
Fuel capacity32,000 lbs (coal)
Boiler
Grate area63.2 sq ft
Firebox area291 sq ft
Tube heating area3,495 sq ft
Evaporative heating area3,786 sq ft
Superheater area882 sq ft
Total heating area4,668 sq ft
Power Plant
Driver diameter63 in
Boiler pressure200 psi
Expansion typesimple
Cylinderstwo, 26 x 30 in
Power
Power sourcesteam
Estimated power2,900 hp (2,163 kW)
Optimal speed34 mph
Starting effort54,724 lbf
Booster10,500 lbf
Calculated Values
steam locomotive
freight
last changed: 12/2023
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