The running tests showed up a serious case of 'tender wobble', it rocked from side to side as it ran (especially after going round bends).
Inspection showed the mounts for the bogey wheel sets were on a smallish pivot; the bogey's being metal tended to rock as they hadn't sufficient surface to rotate on.
bogey's re-attached....
A quick run test on the garage layout - no wobble - another thing off the snag list.
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