Milwaukee Road class A2

The Milwaukee Road's A2 class comprised 47 compound steam locomotives of the 4-4-2 or 'Atlantic' configuration. The Milwaukee Road acquired them in five batches.

Milwaukee Road class A2
Type and origin
Power typeSteam
BuilderBaldwin Locomotive Works
Build date1901–1909
Specifications
Configuration:
​
 • Whyte4-4-2
 • UIC2′B1′ v4
Gauge4 ft 8+1⁄2 in (1,435 mm)
Driver dia.84–85 in (2,134–2,159 mm)
Boiler pressure200–220 lbf/in2 (1.38–1.52 MPa)
Cylinders4 (Vauclain compound)
High-pressure cylinder15 in × 28 in (381 mm × 711 mm)
Low-pressure cylinder25 in × 28 in (635 mm × 711 mm)
Performance figures
Tractive effort20,420–22,190 lbf (90.83–98.71 kN)
Career
OperatorsMilwaukee Road
ClassA2, A2-a, A2-b, A2-c, A2
Number in class47
Scrapped1927–1930
DispositionAll scrapped

The first two batches of 9 and 19 locomotives (classes A2 and A2-a) were built by Baldwin Locomotive Works, and were Vauclain compound locomotives with 84 inches (2.13 m) drivers. The third batch (A2-b) of five locomotive was built by the Milwaukee Road in its Milwaukee, Wisconsin shops with 85 inches (2.159 m) drivers. The fourth batch (A2-c) of 12 engines was built by Baldwin as Vauclain compounds with 85 inches (2.159 m) drivers, while the last batch (A2) was for a pair of engines built by Baldwin as balanced compounds. All members of the class were scrapped between 1927 and 1930.

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