The following glossary is arranged alphabetically with each term catalogued by first letter. Select a letter below to begin.
Uncoupling lever
Also called a cut lever. The device which raises the locking pin in a coupler to allow the knuckle to open for uncoupling.
Unit
A single diesel locomotive.
Unit train
A freight train that carries a single commodity from source to destination and returns empty.
USRA
United States Railroad Administration. The USRA was responsible for the operation of the countrys railroads during World War I.
