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HS2 Approved 
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jonbwfc wrote:
Plenty of countries have double deck trains with rolling stock occupying much the same space as single deck trains. Why we don’t use those is beyond me.
paulzolo wrote:
Tunnels and Bridges, I'd imagine. I'm not quite sure how a double decker train can have the same cross-section as a single decker one, unless you keep the lower deck for people under 5' in height.

The TGV-Duplexs are about 50cm taller than the UK Javelins/Pendolinos, but bridges and the like shouldn't affect them (They still have to fit between the track and the overhead power, after all).

In France with the TGV-duplex, for example, they build down in the space between the wheels. They can do this because their carriages can be 26m long, so all the "below-floor electric stuff" that we have between the wheels gets squashed up at either end of the carriage, leaving a large middle chunk where the floor can be dropped, and a second floor added above. Long carriages require shallower bends, though, and none of the TGV lines (LGVs) have a radius of less than 4km (2.5 miles), and all recent lines have a radius of at least 7km to allow for future speed increases. The UIC-GC loading gauge does allow for slightly wider trains than we have on non-HS lines in the UK as well, although the track is still standard gauge.

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Wed Jan 11, 2012 2:32 pm
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EddArmitage wrote:
jonbwfc wrote:
Plenty of countries have double deck trains with rolling stock occupying much the same space as single deck trains. Why we don’t use those is beyond me.
paulzolo wrote:
Tunnels and Bridges, I'd imagine. I'm not quite sure how a double decker train can have the same cross-section as a single decker one, unless you keep the lower deck for people under 5' in height.

Wooooaaah, weird :D


Wed Jan 11, 2012 2:38 pm
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