TheOneKEA ) gurgled happily, sounding much like they
were saying :

Does this put the a stock back to front?

Erm, they're double-ended, aren't they?

They certainly don't turn 'em round at any of the terminus
stations...

At one time, all A60 and A62 units were double ended - IOW, both cabs
could be used in passenger service. The conversion to OPO and the
robbing of some cabs for spares has led to all but approx. 25-30 units
becoming single ended, meaning they have only one cab that can be used
in passenger service. Of the remaining double ended units, OPO
circuitry has meant that the couplers are no longer fully reversible,
preventing double ended units from coupling wrong-ended (i.e. A to A or
D to D). Other than that, they retain the flexibility of any double
ended unit and can be turned end-for-end on the Watford Triangle and
still be driven in the correct way.

You've lost me.

Both ends of a "Met train" *must* work - because they drive 'em from one
end heading into Baker St from the sticks, and the other end heading back
to civilisation from town.

So what's the difference between the driver's end heading North and the
driver's end heading South that would mean that there's a "right" and a
"wrong" way round?