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As others have said it appears to be the "slack" in the couplings.
One thing you could try to prove it one way or the other would be to introduce some "drag" in the last coach - this will have a slight braking effect & will keep the couplings taught. I've done this in the past with freight stock & as it's cured the problem left it as is.
One thing you could try to prove it one way or the other would be to introduce some "drag" in the last coach - this will have a slight braking effect & will keep the couplings taught. I've done this in the past with freight stock & as it's cured the problem left it as is.
