Aristo SD45 Tips


Posted on Feb 5, 2014

The EMD SD45 was manufactured starting in 1965 so that it represents one of the newest prototypes available in Large Scale. SD45`s are still running all over the country, but they are getting fewer over time due to very high miles in the last 30 to 35 years. The SD-45 was the first locomotive that used an engine with more than 16 cylinders. The 64


Aristo SD45 Tips
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5 model engine in the SD45 carried 20 cylinders. The "645" in the model number indicated the displacement in inches of the engine PER cylinder. This 2 stroke engine developed 3600 horsepower, the largest on rails at the time it was manufactured. The heat generated by the engine was so great that extra radiator area was needed. The wider radiator resulted in the flares on the rear of the long hood. Cooling air was taken in through the side vents and exhausted out the top. This technique was borrowed by other builders later to accommodate larger radiators. There are two major variants of the SD45, the SD45-2 and the SD45T-2. The variants had all new electricals and controls. Both rode on an extended frame and lacked the sloped air intakes. The radiator was extended in a longer hood. The SD45-2 had its air intakes along the top of the hood. The SD45T-2 (tunnel motor) took in air through vents on the sides set down near the walkways. There was nothing inside the hoods in this location and you could look right through the loco and out the other side. This arrangement was developed by the Southern Pacific so that the engines could draw in somewhat cooler air in tunnels. The last unit of a MU consist would often suck in superheated air in a long tunnel because of the blast of engine exhaust from the lead units. It could then overheat and shutdown with disturbing results, such as a stalled train in a tunnel. The "tunnel motors"...




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