If Voyagers were ever the answer, it must have been a bloody stupid question.
Quite. Is there a worse designed train for its intended purpose? I can't think of any other that makes such inefficient use of its internal space.
On the wider point, as others have noted above, much of the overcrowding is a particular locations where
XC▸ are serving local journeys. Birmingham to Oxford is a good example, which really prompts the question as to how much of this market XC should be trying to serve at all. Maybe XC should make fewer stops and we need a separate local' trains running Reading-Didcot-Oxford- Banbury-Leamington etc. to Birmingham. Clearly there are capacity constraints of course... the short sighted removal of 4 track between Dorridge and Tyesely being one of them.