Union Railroad 0-10-2 No. 303. 9 units built by Baldwin 1936-1937 (1936 No. 301-305, 1937 No. 306-309).

Superheated steam two-cylinder with booster (small steam engine as start-up aid) on the front tender bogie,

Class U-108b for heaviest shunting and transfer trains. All machines sold in 1949 to Duluth, Missabe & Iron Range (DM&IR).

(Baldwin-Lima-Hamilton Corporation (Philadelphia), Public domain, via Wikimedia Commons)


BLW logo, white letters, black background


Under the Whyte notation for the classification of steam locomotives, 0-10-2 represents the wheel arrangement of no leading wheels, ten powered and coupled driving wheels on five axles, and two trailing wheels on one axle (usually in a trailing truck).


Schematic of the 0-10-2 Wheel Arrangement. Front of locomotive on left.

(Gwernol, Public domain, via Wikimedia Commons)


Other equivalent classifications are:

  • UIC classification: E1 (also known as German classification and Italian classification)
  • French classification: 051
  • Turkish classification: 56
  • Swiss classification: 5/6


United States

In the US, this type is known as the Union after the only US railroad to have new locomotives built in this arrangement. These were nine 0-10-2s built for the Union Railroad in the Pittsburgh, Pennsylvania area. They were used as heavy duty transfer locomotives rather than switchers. In Greenville, Pennsylvania, one is on static display lettered for the Duluth Missabe and Iron Range Railway No. 604 (Upon dieselization, the Union RR sold all of theirs to the DM&IR) .

The Chicago & North Western Railway converted two 2-10-2 locomotives formerly owned by subsidiary Chicago, St. Paul, Minneapolis & Omaha into 0-10-2 locomotives in 1944. They were classified J-1 both before and after conversion. One was scrapped in 1950 and the other in 1953.


Union Railroad 0-10-2 No. 304 on static display in Greenville, Pennsylvania at the at the Greenville Railroad Park & Museum.

(Doug Kerr, CC BY-SA 2.0 <https://creativecommons.org/licenses/by-sa/2.0>, via Wikimedia Commons)


0-10-2 Union Steam Locomotive Overview

Wheel arrangement: 0-10-2 
Builder: Baldwin Locomotive Works
Build Date: 1936-1937
Construction Number: 61910
Empty Weight: 404,360 lbs.
Weight on drivers: 343,930 lbs.
Driver Diameter: 60 in.
Tractive Effort: 90,900 lbf.
Boiler Pressure: 260 psi.
Cylinders: 28x32 in.
Fuel: Coal