Probable just needs cleaning, but once I had a similar problem develop were a section of track, the engines were slowing down, cleaning did not solve the problem. I lived with it for months until one day I had an engine creeping from opposite direction and the other engine going into the problem section. But didn't slow down. that made me think and experiment. Long story short, it was the track connectors that had gotten dirty rather then the top of rails. Spraying electronic cleaner along side and having it leak into rails solved the problem and hasn't risen back. I now clean all track connectors before laying down and have been surprised by the dirt on and inside connectors. Just to add, I use Fast Track.
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