Saturday, April 30, 2011


Written by  William C. Vantuono, Editor
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National Railway Equipment Company’s new, six-axle 2GS-37C DE N-ViroMotive utilizes existing SD40-2 main frames, rebuilt trucks with D87B traction motors (70:17 gear ratio), and twin gensets equipped with 1,850-hp Cummins QSK50 ULEL certified diesel engines.

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Each engine is paired to a 480 v.a.c three-phase close coupled main alternator rectified to d.c. to provide 3,300 traction horsepower and 3,700 brake horsepower. Depending upon equipment and type of cab, weight on rail is between 390,000 and 420,000 pounds. Length between pulling faces is 68 feet, 10 inches, with a Plate C height. Other features are extended range dynamic brakes with 750A grids, an Atlas Copco GAR 37 rotary screw compressor, an NRE Electronics d.c. chopper for individual motor control, and two cab roof mounted Carrier RV Type HVAC units, plus sidewall heaters on each side with stand-up type heaters optional. The 2GS-37C DE can be fitted with an NREC Crashworthy Cab and short nose assembly with crash posts. It features a front-access-only pressurized electrical cabinet with an NRE Electronics N-Force microprocessor control system. All cab, step, ground and platform lights are NRE Electronics LED lighting. The locomotive’s jacket water and aftercooler cooling are provided by overhead 48-inch, 480 v.a.c. cooling fans. Air flow to the engine air intake and generator cooling is precleaned with monoclone panel filters with a dust bin extractor motor.

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