NW3 locomotives fundamentally consist of a NW2 hood, prime mover, and main generator on a long frame with road trucks. The extra length was needed for a large cab and an additional, full-width hood section that contained a steam generator for passenger service.
Great Northern
EMD NW3 181
General Motors' Electro-Motive Dicision built seven NW3s for the Great Northern Railway in 1942.