Mmmm. Sounds - unnecessarily - intricate and complicated, and to what purpose?Not in my Dapol A4 it isn’t. The tender motor drives the loco wheels via the drive shaft. That’s how it works. Disconnects the shaft and nothing moves. The main drive wheels also have traction tyres for added grip. Some larger scale models may use tender drive. I recall my OO Duchess of many years ago was such
How old is the Dapol?