Milwaukee Road class A2
Power type	Steam
Builder	Baldwin Locomotive Works
Build date	1901–1909
Configuration	4-4-2
UIC classification	2'B1'
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Driver size	84–85 in diameter
Boiler pressure	200–220 psi
Cylinders	4 (Compound)
High-pressure cylinder size	15 in dia x 28 in stroke
Low-pressure cylinder size	25 in dia x 28 in stroke
Tractive effort	20,420–22,190 lbf
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 forth 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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[edit] References

• Edson, William D. (Spring 1977). "Milwaukee Road Locomotives". Railroad History (Boston, Massachusetts: The Railway and Locomotive Historical Society, Inc.) (136): pp. 28–129.