Throughout the early 1970s MLW-Worthington continued to build second generation designs for Canadian railways. The Canadian Locomotive Company (renamed as Fairbanks-Morse, Canada) had closed in 1969, leaving MLW-Worthington as the primary competitor to the rapidly expanding GMD. During this time, at the behest of Canadian National, MLW-Worthington developed the wide-nosed "safety cab", which provided improved crew accommodation and collision protection. First appearing on the M-420 and concurrently on the EMD GP38-2, the safety cab became common on Canadian National and the British Columbia Railway. Canadian Pacific, however, never purchased any such units from MLW. This form of cab design has now become a North American industry standard. Although earlier wide-nosed cab designs on models such as the EMD FP45 and DDA40X bear a superficial resemblance, they lack the advances in collision protection and accommodations of the "safety cab" design.