Under the Whyte notation for the classification of steam locomotives, a 2-10-4 locomotive has two leading wheels, ten driving wheels (in other words, five driven axles), and four trailing wheels. These were referred to as the "Texas" type in most of the United States, the "Colorado" type on the Burlington Route and the "Selkirk" type in Canada. Other equivalent classifications are: UIC classification: 1E2 (also known as German classification and Italian classification) French classification:… (More on 2-10-4)