About The Southern Pacific Railroad

(In Memory of my GrandPa C.F. Gillaspy-Southern Pacific T&NO  1919 to 1951)

 

 

 SP Tunnel Motors Locomotives

 

The Southern Pacific, and its subsidiary Cotton Belt, were the only operators of the EMD SD45T-2 "Tunnel Motor" locomotive. This locomotive was necessary because the standard configuration EMD SD45 could not get a sufficient amount of cool air into the diesel locomotive's radiator while working Southern Pacific's extensive snow shed and tunnel system in the Cascades and Donner Pass. These "Tunnel Motors" were essentially EMD SD45s with radiator air intakes located at the locomotive carbody's walkway level, rather than EMD's typical radiator setup with fans on the locomotive's long hood roof pulling air through radiators mounted at the top/side of the locomotive's body. Inside tunnels and snow sheds, the hot exhaust gases from lead units would accumulate near the top of the tunnel or snow shed, and be drawn into the radiators of trailing EMD (non-tunnel motor) locomotives, leading these locomotives to shut down as their diesel prime mover overheated. The Southern Pacific also operated EMD SD40T-2s, as did the Denver and Rio Grande Western Railroad.

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