"Clive Coleman" wrote in message
...
In message , Jack Taylor
writes
Almost certainly - but you'll only hear them if you're travelling in
the
second or third cars of each four-car train. With the lack of motor
noise
from those trailers (power is provided from the driving cars at each
end)
the sound of the compressors is very noticeable.

There are motor non driving cars, or at least there were on "38" and
"62" stock, perhaps someone can let me know if this is still the case?

'A' stock is formed DM+T+T+DM. The majority of units only have one cab
fitted for OPO - recognisable because the non-fitted cab does not have a red
end, the blue and white continues across the cab end. There is a small pool
of what are referred to as 'double-ended' units, which actually means units
where both cabs are OPO fitted (and both cabs have red ends), which are the
only units that can be used on the Chesham shuttle and the ELL (sets
5056-5066, 5088-5122 and 5232).