In message , at 12:34:19 on Sun, 22 May
2016, Graeme Wall remarked:
How easy would it be to convert the bay, at Gospel Oak, into a thru
platform? When electrification is complete a thru service could be
useful.

There's physically space to convert it to a *through* platform. The
pointwork to the west may need altering to allow east bound trains to
access the platform.

Which means the signalling needs to be changed, and in the current
environment (with ever more safety measures fighting against ever more
remote signallers) it appears that changing the signalling costs Network
Rail orders of magnitude more money than changing the pointwork.
--
Roland Perry