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Reply to "MTH SP GS4 locomotive"

The two black boxes on the board are relays. One is forward and one is reverse.

The transistors that drive those relays are operated close to their maximum levels and sometimes fail.

OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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