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Firstly, what are the locos? A better description would probably help people to offer advice. On the basis of your description, I'd suggest you check the back to back gauge of the axles - the measurement from the back of one wheel to the back of the opposite wheel. Your local hobby store should be able to sell you a gauge to set this with, failing that, it should be 14.5mm - check it with a steel ruler. Assuming both locos are identical this is the most likely reason for the problem. I've had this problem with a few Athearn locos - Dash 9, AC4400, a few dummy locos. I had to do a little filing to sort out the powered locos - to allow the wheels to be set closer together. File a little off the axle gear where the stub axle plugs into it - make sure the brass bearings can turn freely and that you file the same amount off each end of the gear. If you don't feel confident about doing this (It took me a while to pluck up the courage to do it, and then more time to figure out the best method...), try asking in your local hobby store - they might be able to help you, some stores over here offer "loco doctor" services where you can bring in non-running locos for repair, don't know if these exist in the US as well? Hope this helps!
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