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Technical Data |
A total of 312 examples of this locomotive were built for North American railroads between April 1974 and July 1980. This locomotive, along with the SD45T-2, are popularly called tunnel motors, but are officially referred to as SD40-2s with "cooling system modifications" because they were specifically designed to be more effective when operating in tunnels.
The major differences between this locomotive and its non-tunnel motor SD40-2, are the radiator intakes and radiator fan grills located at the rear of the locomotive. The radiator air intakes in this model are located along the deck to allow more fresh, cooler air to enter and less hot exhaust fumes lingering around the tunnel's ceiling.