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Tunnel Motors
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[quote]QUOTE: <i>Originally posted by chad thomas</i> <br /><br />The tunnel motor design is all about pulling in cooler air while inside the tunnels and snowsheads. But naturally they will cool down in between tunnels. Also remember this is mostly for the trailing units. SP liked to run monster drags when it could and Donner is no exception. So you would have these monster consists of up to 8-9 units on the point. When you are grinding uphill at little more than a walking pace behind 8 other units doing the same, thing can get pretty hot in those tunnels. If the cooling system can't keep up the engines overheat and will unload to protect themselves. <br />[/quote] <br /> <br />Well, not to argue,...but I really do think that the issue I'm thinking of stated that the belief that tunnel motor design is an "in tunnel" benefit was a widely held misconception, because the benefit b eing designed for was actually how rapid the motors could be cooled in between tunnels. <br /> <br />The only reason why I even remember it was because it seemed like such a surprise at the time. <br /> <br />Little foggy on the following, but I seem to remember the source as being EMD's *** Dillworth, and MAYBE the issue was the one that had the "Greatest/ worst" loco's of all time featured as a special article.
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