David Cantrell wrote:
On Fri, Oct 04, 2013 at 11:51:57PM +0100, wrote:

http://www.dailymail.co.uk/sciencete...ditioning.html

Air conditioning, huh? I wonder where the exhaust heat is going to go.

Here's some more info:
"Siemens is working with a specialist partner on a novel concept to provide
onboard air-conditioning, a major challenge in London because of the tight
tunnel profile and the problem of dispersing heat generated by operations.
The proposed system features onboard tanks containing a phase-changing
polymer which would be cooled below its freezing point when the train was
running on surface sections of the network. On underground sections heat
transferred from the air-conditioning system would be used to melt the
polymer again.

The train would also be designed to produce less heat than existing stock,
being 30% more energy-efficient and 20% lighter than 'similar modern metro
trains', and able to use regenerative braking to bring the train almost to
a stand.

Low-profile LED lighting would be used throughout, helping to maximise
headroom. Other proposals include advertising screens able to show changing
images and video, and a smart information system which would provide
passengers at stations with real-time information on which parts of the
next train were least busy."

From
http://www.railwaygazette.com/news/u...und-train.html