The Mainline Deans Goods mentioned in the last posting as “lost” perhaps isn’t after all. A posting on RMWeb quickly gave me the information that the tender drive is by 2 wheels only and that my problem was probably excess friction. Light oiling of the engine’s wheels and cleaning the traction tyres got it running light engine with some slipping. After one circuit it derailed. Lifting it up showed that the 3rd rail pick up had detached itself – the glue attaching the metal pick up to the plastic body had failed. Now all it will take is to refix the pick up and I might have a runner again. Probably a job for laters as getting the position absolutely correct will take an amount of trial and error.