Accurascale and Revolution Trains are teaming up to produce Mk5 coaches in 00 and N gauge.   The two companies are co-operating on research and development and will be producing complete ranges of the Mk5s operated by Caledonian Sleeper and Trans Pennine Express's Mk5a vehicles.     Both types of Mk5 are being manufactured by CAF of Spain, and they are the first loco-hauled vehicles built for Britain's rail network since the Mk4 Inter-City 225s which entered servic