Union Railroad 0-10-2

Union Railroad 0-10-2

Power type	Steam
Builder	Baldwin Locomotive Works
Build date	1936–1939
Total production	10
Configuration	0-10-2
UIC classification	E1'
Gauge	4 ft 8½ in (1435 mm)
Driver size	61 in (1550 mm)
Total weight	644,510 lb (292.34 t)
Tender capacity	12,000 US gal (45,000 L) water; 14 short tons (13 t) coal
Boiler pressure	260 lbf/in² (1.8 MPa)
Cylinders	2
Cylinder size	28 in bore × 32 in stroke (711.2 mm × 812.8 mm)
Valve gear	Walschaert valve gear
Tractive effort	90,900 lbf (locomotive) + 17,150 lbf (tender booster) (404.3 kN + 76.3 kN)
Career	Union Railroad, Duluth, Missabe and Iron Range
Number	URR 301-310; DM&IR 601-610

Ten Union Railroad 0-10-2 steam locomotives were built in 1936–1939 by the Baldwin Locomotive Works. These were the only 0-10-2 locomotives ever built in the United States and this purchase gave the name "Union" to this type.

The Union Railroad was a switching and transfer line owned by U.S. Steel, serving a number of plants in the area and connecting with six trunk line railroads. Operation was only at low speed, thus a leading truck's stability was not required. The intent was to eliminate helper requirements on grades, and thus a locomotive larger than the Union's previous switchers and 2-8-0 "Consolidations" was needed. Ten driving wheels allowed the application of sufficient tractive effort within the axle load limits of the line, and the requirement for a large firebox and plentiful steam-raising ability necessitated the trailing truck. To increase tractive effort still further, a booster engine was fitted to the leading tender truck.

Upon dieselization of the Union in 1949, the locomotives were sold to fellow U.S. Steel railroad the Duluth, Missabe and Iron Range, where they served until 1962. One of these locomotives survives as a static exhibit at Greenville, Pennsylvania.