If you are talking about moving buses by train there were a number of movements using weltrol type wagons in the 40's and 50's. I know East Kent vehicles on loan to the government were moved this way when requiring maintenance.
I'm not aware of buses moving by rail in Britain in recent decades. Certainly it would only ever have been possible with a single decker , and even then I can understand why a weltrol (with a lowered centre) would have been used
Much the same applied to tanks - special Warwells were used
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