In message , James Farrar
writes

Where would they get the drivers and trains from at such short notice?
(We have to have at least 2 weeks notice of change of duties).

Don't they have some extra stock available? (above number needed for
normal peak hour service?)
Is there any emergency procedure to recall staff to work?

Hiow would they manage to impose that? Crow would pull everyone out on
strike!

Not me he wouldn't, I'm not in his union.

I can't be recalled to work as I (as do the rest of us) work five days
in seven. For safety reasons, I'm not allowed to work my rest days. In
fact it's in my COE that I can't even engage in a part time job, if I
wanted to, without the permission of my employing manager. When I'm at
work, I'm rostered to the hilt, often getting off a train exactly at the
minute I book off duty. We cannot be asked to work overtime as that
would potentially take us over our (legal) parameters.

Those on annual leave are on leave and they cannot be called into work.

The only (vague) possibility would be to use a couple of spares, but as
has already been mentioned, most lines are already at capacity train
wise and no more can be fitted in without causing delays.
--
Steve Fitzgerald has now left the building.
You will find him in London's Docklands, E16, UK
(please use the reply to address for email)