The railway received its first diesel locomotive in June 1948, a General Electric 65-ton locomotive. Over the next two years the railway acquired six GE 70-ton locomotives. In the 1950s, the railway bought RS-3, RS-10, and RS-18 locomotives from the Montreal Locomotive Works (MLW). The railway had fully dieselized by 1956, and by the end of the decade had nearly 40 diesel locomotives. The railway would purchase new locomotives exclusively from MLW until 1980. During the 1970s, the railway also purchased several used locomotives, mostly American Locomotive Company (Alco) models from American railways. In the 1980s, the railway acquired new SD40-2 locomotives made by General Motors Diesel, and used SD40–2s made by General Motors Electro-Motive Division (EMD). In the 1990s and early 2000s, a number of locomotives were purchased from General Electric. Purchased new from GE were 26 (4601-4626) C40-8Ms, 4 C44-9WLs and 10 C44-9Ws. Older, secondhand GE locomotives in the form of B36-7s, C36-7MEs, and B39-8Es were also purchased.