1D locomotives

Under the Whyte notation for the classification of steam locomotives, ' represents the wheel arrangement of two leading wheels on one axle, usually in a leading truck, eight powered and coupled driving wheels on four axles, and no trailing wheels. In the United States and elsewhere, this wheel arrangement is commonly known as a Consolidation', after the Lehigh and Mahanoy Railroad’s Consolidation, the name of the first 2-8-0.