RS-18s in the 1970s
Here are a few slides I purchased showing CN RS-18 locomotives in the 1970s.
The RS-18 was built by Montreal Locomotive Works (MLW) as the Canadian version of the Alco RS-11. These locomotives had an 251B diesel engine under the long hood powering the traction motors driving all four axles. Just over 350 were produced, mostly for CN.