Two recent engine failures have spurred this advisory post. The units involved are both from the Bachmann DCC on Board line, one a New York Central RF16A (Shark Nose) and the other a Penn Central GP38-2.
The Problem: Plastic Coupling on metal shaft that connects the drive shaft to the rear power truck. Seems plastic coupling works it's way free from the smooth metal shaft causing the rear truck to lose power.
Solution: Place a small dab of gel CA the hole of the coupling and then insert coupling onto metal shaft. Allow to dry and cure overnight. Reassemble and test.
Misc Notes: In addition to both units being from the Bachmann DCC on Board releases the failures occurred while both units were in multiple unit operation. The RF16A being run in an A-B-A consist of Bachmann DCC on Board Shark units and the GP38-2 being run with a Bachmann DCC on Board GP40.
NYC RF16A A-B-A consist. The rear unit, RF16A #4173 also suffered coupling failure on the rear truck.