In article , Boltar
writes
Do trains ever run down these tunnels or are they just for emergencies only
or derelict?

In many cases they're used as stabling sidings.

Does anyone know if they have special exits to the street at the
end, since if a train did run down there and be stabled how would the driver
get out , would he have to walk down the track back to the terminus station?

Firstly, he can walk down the train to the other end. After that, if the
line is intended as a stabling siding there will be a walkway or
passageway from that point. Otherwise, yes, he'd have to walk along the
track.

--
Clive D.W. Feather, writing for himself | Home:
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In message , Clive D. W. Feather
writes
Firstly, he can walk down the train to the other end.
This was the practice when reversing at Tooting Broadway, Kennington
from the city, etc.
--
Clive

In article ,
(Clive) wrote:

In message , Clive D. W. Feather
writes
Firstly, he can walk down the train to the other end.
This was the practice when reversing at Tooting Broadway, Kennington
from the city, etc.
--
Clive

As indeed was the practice at Euston and Clapham Common. Nine trains used
to start from Clapham Common on a weekday morning (1916). Presumably this
was three each from the two overrun tunnels (Nos. 1 & 2 sidings) which
were 450 feet long. Euston was smaller, with only 227 feet long overrun
tunnels.

Roger