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[email protected] · March 18th 10, 04:54 PM posted to uk.transport.london

In article , d ()
wrote:

The 3rd cab wasn't in the middle, it was 2 cars from the end. Hence
the subject line. I'd not seen that configuration before - they're
usually in the middle.

Usually maybe but there's no reason why they have to be.

Why are there extra cabs anyway? The 92 stock was always going to be 8
cars everywhere AFAIK. Are they just spares in case of failure?

They wanted the flexibility while cutting down the number of cabs. The R
stock demonstrated the costs of fixed train formations, with every car
having an allocated place in a train (apart from the 6-to-8 car addition
of a second 2-car unit) and most stock from 1960 till 1992 having more
cabs than really needed.

--
Colin Rosenstiel