MIG wrote:
On Jul 12, 12:50 am, asdf wrote:

I suppose it depends whether the new build of stock has the same
coach length as the 313.

Ah - so not actually meant for the 313s after all. ;-)

Or take a spare trailer from the 315s if they are soon to be
withdrawn, or from the spare 508s which are already being withdrawn.

The 315s are not likely to go anywhere before Crossrail happens, by which
time the 313s will have gone from the North London lines. There are no
withdrawn 508s anywhere. Southeastern have put half-a-dozen sets into warm
store but still can't squeeze enough out of the rest of their fleet to get
rid of the other half-a-dozen. With the increase in ridership back in their
spiritual home, Merseyrail are apparently itching to get their hands back on
any spare sets when they go off-lease back to the RoSCo.