Ah ,well, in the good old days locos were just moved about as required, usually stuck into a goods train, or maybe towed by a light engine(with a caretaker crew , of course)Nowadays a charge has to be made(as the railways must turn a profit)to shift things about, and "Hey Presto! " the road haulage industry can undercut the prices again. Mind you ,as they have to use a specialised haulier it will still cost a fair old wad of money to do the job. I suspect the above picture truck and trailer would cost at least the thick end of £250k .The last new truck I drove was £85k about 12 years ago and that was without a body or a Hiab crane mounted< and was only a 6 wheeler.
Phil