Tags: Locomotive.
Under the Whyte notation for the classification of steam locomotives 4-12-2 represents the wheel arrangement of four leading wheels twelve coupled driving wheels and two trailing wheels.Other equivalent classifications are:AAR wheel arrangement: 2-F-1UIC classification: 2′F1′ (also known as German classification and Italian classification)French classification: 261Turkish classification: 69Swiss classification: 6/9This arrangement was named the Union Pacific type after the only railroad to use it.Only one type of 4-12-2 was built: the Union Pacific Railroad’s 9000-series locomotives 88 of which were built by ALCO between 1926 and 1930.
