- Milwaukee Road class A2
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Milwaukee Road class A2 
Power type Steam Builder Baldwin Locomotive Works Build date 1901–1909 Configuration 4-4-2 UIC classification 2′B1′ v4 Gauge 4 ft 8 1⁄2 in (1,435 mm) Driver diameter 84–85 in (2,134–2,159 mm) Boiler pressure 200–220 lbf/in² (1.38–1.52 MPa) Cylinders 4 (Vauclain compound) High-pressure
cylinder size15 × 28 in (381 × 711 mm) Low-pressure
cylinder size25 × 28 in (635 × 711 mm) Tractive effort 20,420–22,190 lbf (90.83–98.71 kN) Career Milwaukee Road Class A2, A2-a, A2-b, A2-c, A2 Number in class 47 Scrapped 1927–1930 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.
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.
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