"MIG" wrote

They seemed to cope somehow. The same on the Picadilly after Terminal
4 was opened.

I remember the 1962 stock on the Central always facing the right way
for years, despite the obvious loop. Maybe anything that went in the
depot from the Grange Hill end always left that way, but then one year
in the 1980s or so they seemed to stop bothering and it ended up fairly
random.

A few 3-car sets of Piccadilly stock were built with cabs at both ends, so
thatb they could substitute for either half of a 6-car train formed of two
unidirectional half-sets. A 3-car set was also needed for the Aldwych
branch.

For many years Woodford to Hainault was treated as a branch, with a service
entirely separate from the main Central Line service. Trains from the
Epping/Hainault - Ealing Broadway/West Ruislip service, if they went to
Hainault depot, always went via Newbury Park. Woodford - Hainault was used
for trials of the Victoria Line automatic operating system.

Peter