On 02/09/2016 22:13, Recliner wrote:
Incidentally, how are the Crossrail lines named in terms of "up" and
"down"?

I've read that it will use Tube-like Eastbound and Westbound on its own
segregated tracks. Presumably it'll use the existing Up and Down terms on
shared tracks, like the GWML.

That makes sense.

While it would be possible to change from Up to Down at (say) Pudding
Mill Lane portal, I doubt they want the risks of confusion.