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Reply to "BCR in railking"

I’m no expert, but, I don’t think MTH produced a 4v system. Think they came in 5v or 3v flavor. Easiest way to tell is check the shape of the charging port on the undercarriage. Round = 5v, rectangular = 3v. Also, to start off, 30-xxxx railking model number would be good for you to get more comprehensive, helpful answers.

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