Roland Perry wrote:

In message , at 23:48:27 on Sun, 31 May
2015, Mizter T remarked:
Er, I don't think so! Crossrail will be an intensive metro service
through the core, operating with ATO signalling and specifically
designed and high performance trains. There's not going to be
anywhere to reverse trains like you suggest.

So if there's a "one under" at Maryland, the whole core freezes up
for a couple of hours?

I would expect there to be crossovers allowing trains to turn in
emergencies or due to engineering work. That doesn't mean it would be
practical to have trains reversing at Stratford all day every day,
without building an extra platform.

Peter Smyth