On Fri, 9 Jul 2004 10:07:20 +0100, Tom Anderson
wrote:

I take your point. I understand that in some places, they have
double-decked trams

DD trams used to be standard in the British Isles, and they also
existed elsewhere but fell out of favour. They are now found in
Blackpool, Hong Kong, Alexandria and Birkenhead (which hardly counts).
None are articulated.

and trains, too. Seems like an easy and general way to
increase capacity (obviously not very practical for tube lines, though).

Not, a tube, but the Thameslink-like RER in Paris has double deck
trains.

Talgo are building a prototype double-deck articualted train, which
they claim will be a first. Double-deck trains are common, but at the
moment they all have single-deck gangways between carriages. The Talgo
train will be double-deck throughout its full length.
--
Arthur Figgis Surrey, UK