Hi Leo, would you believe it, the tender drive unit just stopped working, absolutely dead.It was a lovely smooth running quiet unit and it just died.I can't see anything obviously wrong so I'll need to strip it down when I get a chance and see what the problem is. But having said that , the three Mainline loco mechanisms on my 800s are running fine so adding tender drive methinks will be overkill because I never enviseage big long heavy trains.The mainline units are a wee bit noisy but they actually don't sound un-steam engine-like in character when doin so.So they'll do the job. I'm afraid due to work and other commitments all modelling activity has had to stop for now .But work is work. A living has to be made !! But in the words of Scwarzeneger...... I'll be back !