I have a model railroad and the train speeds up and slows down at different points. Why does this happen?

Question by J: I have a model railroad and the train speeds up and slows down at different points. Why does this happen?
I am trying to find out why this happens and how can I fix it.

Best answer:

Answer by Scott W
clean the rails they are dirty and not making good contact so the train lacks the power it needs from the track and slows down,take some ulta fine steel wool and clean those spots or the whole track.

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