A total of 84 of the GE C40-8M, a Co-Co type powered by a V16 7FDL prime mover, were built by General Electric from 1990 to 1994, part of the GE Dash 8 Series, and often referred to as a Dash 8-40CM.
Mechanically identical to the Dash 8-40CW, the Dash 8-40CM was constructed only for Canadian railways. It is distinguished from the Dash 8-40CW by a full-width cowl body and the use of a Canada-specific nose and windshield configuration. The trucks (bogies) also differ - all are taken from retired Alco/Montreal Locomotive Works locomotives. Here a Dash 8-40CM is on the point of a stack train at Red Pass, BC.