The Milwaukee Road's A2 class comprised 47

compound Compound may refer to: Architecture and built environments * Compound (enclosure), a cluster of buildings having a shared purpose, usually inside a fence or wall ** Compound (fortification), a version of the above fortified with defensive struc ...

steam locomotive A steam locomotive is a locomotive that provides the force to move itself and other vehicles by means of the expansion of steam. It is fuelled by burning combustible material (usually coal, Fuel oil, oil or, rarely, Wood fuel, wood) to heat ...

s of the or 'Atlantic' configuration. The

Milwaukee Road The Chicago, Milwaukee, St. Paul and Pacific Railroad (CMStP&P), better known as the Milwaukee Road , was a Class I railroad that operated in the Midwestern United States, Midwest and Pacific Northwest, Northwest of the United States from 1847 ...

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 The Baldwin Locomotive Works (BLW) was an American manufacturer of railway locomotives from 1825 to 1951. Originally located in Philadelphia, Pennsylvania, it moved to nearby Eddystone, Pennsylvania, Eddystone in the early 20th century. The com ...

, and were

Vauclain compound The Vauclain compound was a type of compound steam locomotive that was briefly popular from the early 1890’s to the mid-1900’s. Developed by the Baldwin Locomotive Works, it featured two pistons moving in parallel, driving a common crosshead ...

locomotives with drivers. The third batch (A2-b) of five locomotive was built by the Milwaukee Road in its

Milwaukee, Wisconsin Milwaukee is the List of cities in Wisconsin, most populous city in the U.S. state of Wisconsin. Located on the western shore of Lake Michigan, it is the List of United States cities by population, 31st-most populous city in the United States ...

shops with drivers. The fourth batch (A2-c) of 12 engines was built by Baldwin as Vauclain compounds with 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.

References

* A2 Baldwin locomotives 4-4-2 locomotives 2′B1′ n4v locomotives Vauclain compound locomotives Steam locomotives of the United States Railway locomotives introduced in 1901 Scrapped locomotives Standard-gauge locomotives of the United States {{steam-loco-stub