Flux loops
I advise building a test track first before building a engine. You must not have any flux loops. They will cause a failure to run. Drilling a couple of wooden boards and installing the magnets in them work well for a test. If your magnets are too strong or too close or both, the north pole flux will find it's way to your south pole flux on the next magnet in line or vice versa. Each magnet must act independently from the other. To correct flux loop problems, use shields around the magnets such as ferrite or the equivalent. Movement of the magnet spacing can help also.
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