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Older Locomotives With Demagnetized Motors

Glen would like feedback and writes:

Can a locomotive motor become weaker and lose power over time? A friend told me he heard heat can demagnetize motors with “excessive use”, but when I asked how many hours running would be “excessive use” he said he didn’t know and hadn’t asked. I’m not convinced, because I have some 35+ year-old engines that still run as good as new, but I do maintain them well. Does someone know for sure if this can happen or not, after how many hours of running, and are some brands/types of engines more susceptible? Just skeptical and curious?

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