0-10-2
An 0-10-2, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is a locomotive with no leading wheels at all, ten driving wheels, and a two-wheel trailing truck.
United States In the US, this type is known as the Union after the first and only US railroad to purchase locomotives of this arrangement, the Union Railroad in the Pittsburgh, Pennsylvania area. 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. Ten of these locomotives were built by the Baldwin Locomotive Works for the Union Railroad between 1936 and 1939. Upon dieselization of the Union in 1949, the locomotives were sold to fellow U.S. Steel railroad the Duluth, Missabe & Iron Range, where they served until 1962. One of these locomotives survives as a static exhibit at Greenville, Pennsylvania.
Specifications - Road numbers: 301-310
- Driver diameter: 61 in
- Weight: 644,510 lb
- Tractive effort: 90,900 lbf (locomotive) + 17,150 lbf (tender booster)
- Boiler pressure: 260 lb/in²
- Cylinders: 28 in bore × 32 in stroke
- Tender capacity: 12,000 US gal water; 14 tons coal
Europe
In Germany, a number of narrow gauge tank locomotives were built with an 0-10-2 configuration. All used some form of articulated drive that allowed the outer driving axles to move sideways or radially to negotiate curves. An example was a group of locomotives built for the narrow gauge lines of Bosnia that utilised the Klose System for an articulated drive.
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