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[quote]QUOTE: Originally posted by cabbage This may sound amazing silly -but check how much weight of the loco is actually on the driving wheels and that they actually make good mechanical contact with the track. [/quote] Not silly at all. I had this exact problem with an LGB U Class. The spring on the trailing truck was too powerful and was taking some of the weight off the drivers (leading to problems with gear mesh as well as lack of grip). I've since cut it down a bit (following advice from one of my local shops) and the improvement is noticable - it sits a lot more like the prototype now while before it was almost balanced on the spring, the gear problem is also solved as more of each tooth is in contact with the worm gear. I don't have enough track (or an unmodified U) to do a proper test but it worked for me.
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