These designs represented the final development of the 70′ coach and marked the beginning of the bow-ended era. The bow end reduced the length of the corridor bellows and required the introduction of buckeye couplings and fold-down buffers. These two diagrams had one bow and one flat end so that they could be marshalled with standard flat ended stock; they were externally identical except that C44 had the bow end on the left when viewed from the corridor side whereas on C45 it was on the right.
They were introduced first on the Paddington-Cardiff service and became known as South Wales Stock; however they were dispersed more widely as newer designs were introduced.
The photo shows a C44 carriage.