In message , at 18:11:13 on Mon, 1 Jun 2015,
Peter Smyth 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.

You might manage it by "stepping back", but the discussion has revealed
the reversal is more likely to be at Abbey Wood.
--
Roland Perry