Two MLW RS-18's 8761 and 8753 lead a GMD F7B 443x on a freight train passing through Dorval, QC.
This was a typical power consist for these years as was the scene below with a mix on new and old units of two makes.
Both photos: September 1978 Randy Kotuby

Three-year old 5724 GMD SD40-2, 4558 MLW M636 and 42xx C424 lead a freight through Dorval, QC