Union Pacific SD-40T-2 Tunnel Motor Diesel

On Western rails, "tunnel motors" refer to specialized ElectroMotive SD-40T-2 diesel locomotives uniquely designed for routes like the Southern Pacific's snowy Donner Pass line with miles of tunnels and snowsheds. In such enclosed spaces, SD-40T-2 locomotives were kept running by pulling in cool air through vents placed low on the hood. A conventional diesel's rooftop vents choked on the hot air near the tunnel ceiling and overheated the engine. The Lionel version of this unique diesel is TMCC-equipped and includes many separately applied details including the distinctive see-through grilles on the sides of the unit as well as horn placement and headlight arrangements specific to each road name. The SP version even includes an L-shaped front cab window and operating Mars light.

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