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Slowing down on curves is caused by increased friction and train resistance. The energy required to pull the train round a curve will always be greater than to do so on the straight. The longer and heavier the train and the tighter the curve the worse it gets.

If you run the engine light round 5' radius curves there won't be any problem . This isn't the answer you want to hear...

Unfortunately this is a property of physics operating here, and attempts to avoid the laws of physics don't work - otherwise teleportation devices and faster than light travel wouldn't be confined to TV Sci-Fi

The only remedy I can suggest is increasing the energy supplied to the loco as it enters the curve, and decreasing it as it leaves. There are 2 ways of doing this - turn the knob on the controller, or possibly a feedback controller

Sorry , but I'm afraid there isn't a real fix here
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