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QUOTE (hoarp001 @ 3 Jul 2007, 23:27) <{POST_SNAPBACK}>I have been advised that adding weight over the drive bogie will help. how do I go about this? Can i get lead fishing weights or something similar? How much should I add?

I also thought about roughing up the surface of the rails, maybe with some wire wool or a wire brush. The rails are so smooth, I feel this is why it is slipping. If i roughed up the rail surface would this help provide traction for the coaches little tiny wheels.
I suppose the ideal thing would be to bend space-time into an Escher drawing so that the DMU can always be going down the helix!

Failing that then adding weight should enhance adhesion, Electric Nose suggests self-adhesive lead strips because you can build up the layers slowly and test in between to see how much works. See here. This is a relatively cheap option to try first.

I would strongly advise against roughing up the track surface - it's smooth on the prototype, and dust and dirt will collect in the scratches and reduce conductivity to the wheels. Reduced electrical contact + helix = leaves on the line... You will forever be cleaning the track and to no avail. More weight means more friction and so better traction...but of course more work for your motor/pancake/frying-pan to do. The only other option would be to cannibalise another DMU and put a second powered bogie in but this is obviously much more expensive.

Defenestration is of course always an option of last resort for the said DMU and almost as theraputic as smashing up a Spanish hotel when invited to do so by the owner...

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