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My club has had the same problem. First a little background, We have HO on one side and then we have O gauge on the other, IT IS UNIQUE. I am guessing that you are using Atlas 9" sections to bridge the gaps. You may need to trim the ends of your tracks as the track grows with temp. creating a hump. What I do is keep some flex track and make jumpers every show to see if the expansion is bad. I have successfully operate 30 car trains of autoracks with helpers on the rear with no problem. And check those cars too!
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