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[quote user="jbinkley60"][quote user="UP2CSX"]Jeff, nice scenery and a nice video. You've got some big ones to try five units and 40 cars on a home layout. [:)] I don't know if you noticed it but there's a definite bump just as the train enters the bridge. I only seem to see it in the longer boxcars so I'm not sure if it's in the track or a clearance problem.[/quote]It's on a curve and you are seeing the force of all of the cars behind wanting to pull the cars into the curve.  The bump you are seeing are the cars leaning back upright as they exit the curve.  If you look really close you'll see them swaying side to side. I actually had a few derailments on the first couple of attempts. I had to move some of the lighter cars towards the back to eliminate it.  The curve is also at the top of a long grade so the drawbar pressure is at its maximum.  I didn't notice the same effects on 35 cars so I believe I am right at the maximum limit for my layout, unless I put a helper in the middle somewhere. [/quote]Oh, you mean like my 22" curve at the summit of a 4% grade?[banghead]I need helpers for a train half as long!
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