On Jan 6, 12:31*pm, John B wrote:
1) the depot is at Cockfosters. Not sure what time this incident took
place, but if the train died in a place where it blocked or

MId to late afternoon.

significantly impaired depot access, then that's going to have an
obvious knock-on effect on the line

The knock on effects were caused (as usual), by terminators sitting at
arnos grove for ages before being sent back down the line. The concept
of stepping back seems to be a foreign one to the piccadilly line and
its staff.

2) normal line operation is based on turning some trains at Arnos

extremely expensive redundancy (in this case, adding signalling and
track work at Arnos so that it can be used as a full-capacity terminus

Its already got it. All it needs is for the staff to put some effort
into being ready for their train when it arrives and the signaller to
switch the route quickly. Arnos was a terminus anyway for a while
until the section to cockfosters was completed.

mirroring Cockfosters, or turning one of the stations north of Arnos
into an alternative reversing point - in either case, these will only

There is one - its called Oakwood.

B2003