In article ,
D A Stocks wrote:
"Robin9" wrote in message
...

'D A Stocks[_2_ Wrote:
;123973'] Don't Southern run some 12-car trains as 4 x 3-car?

--
Colin Rosenstiel

Yes, used to be quite common on Brighton fast services.

--
DAS
In the days of nationalised British Railways most Brighton fast services
were 12 car trains; and they didn't stop at Clapham Junction either.

But they weren't 4 x 3-car, which was the question I was answering.

There were mixed 2, 3 and 4 car formations of SR slam-door stock, but I
don't know if it was possible to run more than 3 units coupled in service
,,,

I don't remember there being any restriction on that in control terms.
Up to about 1969/70, MLV+MLV+Cep+Bep+Cep was common on boat trains -
effectively five units. I think I recall workings later on such as
8Hap - four units. My early notebooks unfortunately didn't include
train formations.

X-post back to uk.r for more informed comment ...

Nick
--
Serendipity: http://www.leverton.org/blosxom (last update 29th March 2010)
"The Internet, a sort of ersatz counterfeit of real life"
-- Janet Street-Porter, BBC2, 19th March 1996