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I'm not quite sure what effect you are describing: would I be right in assuming that they speed up and slow down so opening and closing the inter-coach gap as they run?

If that's so, you need to tighten up the couplings. I have done this with some Lima DMUs: take the metal coupling hook and, looking at it from the top, put three bends in them. This adds an adjustable Vee shape into what was a straight line and allows you to tighten up the free play between couplings. If you want them to uncouple, leave just enough free play to allow he hooks to disengage from the horizontal bar of the adjacent carriage. If youdon'tneed to uncouple regularly, you can tighten the gap right up, in which case, file a small notch, well off-centre, in the coupling bar to ease manul uncoupling.

If I've misunderstood your problem, please explain further and I'll try to help some more.
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