"Boltar" wrote in message
oups.com...

units can be coupled to each other. The reason this
is not done on all stock is because it requires the
electrical wiring to be duplicated through the
coupling (couplers are either left or right handed,
IYSWIM), which is more expensive and more prone to failure.

I've no idea how its actually done but couldn't they just
be connected with seperate cables (instead of via the coupler),
which twist in the middle so to match up with the other unit?

eg:

A --- ----B
\ /
\ /
/ \
/ \
B--- ----A

Or just arrange the wires vertically in the middle.... but I don't think
it's that simple.

--
John Rowland - Spamtrapped
Transport Plans for the London Area, updated 2001
http://www.geocities.com/Athens/Acro...69/tpftla.html
A man's vehicle is a symbol of his manhood.
That's why my vehicle's the Piccadilly Line -
It's the size of a county and it comes every two and a half minutes