Tom Anderson wrote:
Hang on, those crossovers don't do anything to help trains on the outer
pair (from the east) get onto the central pair (to the south). Unless the
northern one is a scissors (there being an outer-to-inner crossover on the
up pair to the east) - i can't tell.

According to this:

http://www.chesapeake.net/~cambronj/...light-rail.jpg

There are crossover allowing trains to/from the east to reach the inner
two platforms at Poplar, which lead to/from Canary Wharf. Try scrolling
the aerial photo east a bit.

U