In message , Clive D. W. Feather
writes
In the case of the Central, reversing also means driving in Restricted
Manual, because there are no codes for that direction. Stopping the
next train is also harder, because there may be no signal between it
and the station.

Overall, it could easily take 15 to 20 minutes to get a train reversed
to the previous station.
All this surprises me, I thought reversing in tube was banned under any
circumstances.
--
Clive