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My N scale Kato sd-45 running on DC progressively gets slower as the run time gets longer. While other trains appear to speed up as the running time lengthens, this particular locomotive somehow slows down to a crawl. This locomotive had prior problems, which caused me to convert it into a dummy unit. She was put back together about a week ago, and ran fine until now. It seems to get tired... what may be the problem?

Thank you!
Brandon
 

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Normally as something heats up, things start to expand. Look for areas around the motor and driveline that need additional lubricant or as things start to expand, they start to rub. If you do not see any sign of that after giving necessary areas a touch of lube, remove motor, attach wires and let it run for a while (normally the time it takes for it to slow down and see if it slows down). If it does, give them motor a good cleaning and try the test again. If it doesn't slow down, taadaa! Problem solved. If it does slow down again, time for a new motor.
 
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