Camelback locomotive

The Erie Railroad's L-1 class were the largest camelbacks built, and the only articulated examples.

A camelback locomotive (also known as a Mother Hubbard or a center-cab locomotive) is a type of steam locomotive with the driving cab placed in the middle, astride the boiler. Camelbacks were fitted with wide fireboxes which would have severely restricted driver visibility from the normal cab location at the rear.