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The Government White Paper Delivering a Sustainable Railway states trains that travel at a speed of 350 kilometres per hour (220 mph) currently use 90% more energy than at 200 kilometres per hour (125 mph); which results in carbon emissions for a London to Edinburgh journey of approximately 14 kilograms (31 lb) per passenger for high-speed rail compared to 7 kilograms (15 lb) per passenger for conventional rail. Air travel uses 26 kilograms (57 lb) per passenger for the same journey. The paper questioned the value for money of high-speed rail as a method of reducing carbon emissions, but noted that with a switch to carbon-free or neutral energy production the case becomes much more favourable.The House of Commons Transport Select Committee Report in November 2011 (paragraph 77) concluded that the Government's claim that HS2 would have substantial carbon reduction benefits did not stand up to scrutiny. At best, the Select Committee found, HS2 could make a small contribution to the Government's carbon-reduction targets. However this was dependent on the government making rapid progress on reducing carbon emissions from UK electricity generation.
How do they sync the phase of the regenerated supply coming off the train with the supply rail?
the railway is split into electrically isolated ‘sections’, connected to one of the three [phases]
Typically, railways run on 25kV AC or between 600V-3000V DC.
The presumption of "greenness" is false, surely.
Make (trains) lighter
(a train) produces unacceptable noise pollution
I am an engineer who has had an excellent carreer,
I am very sorry for the remarks last night, I was tired and irritated with something else that happened over a 1000 years ago.