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Old April 27th 07, 09:57 AM posted to uk.transport.london,soc.men
Tom Anderson Tom Anderson is offline
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First recorded activity at LondonBanter: Oct 2003
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Default Does Anyone Know When The New Ubdersea Tunnel Will Be Completed?

On Fri, 27 Apr 2007, John Rowland wrote:

Tom Anderson wrote:
On Thu, 26 Apr 2007, Dustbin wrote:

You cannot build tunnels across continental plates.

A Bering Strait bridge is the answer; one platter can rest upon
rollers with each end on different continents. It would still
require good maintenance and the platter would have to be replaced
regularly but it is not impossible.


How do you interface the track running across it at the ends, though?


http://commons.wikimedia.org/wiki/Im...b_ExpJoint.jpg

Or... the track leaves the platter sideways. When the platter moves, the
track moves sideways (similar to points) but doesn't have to change
length.


The track on the platter would have to be a segment of a circle, with the
exit track being a radius, of course.

Alternatively, how about something like a set of points, with the exit
track branching off the platter track, where the platter rails can slide
through the whole assembly. You couldn't have the notch in the main track
rail you usually have at points; perhaps you could grade the branch rails
a bit, and have them fly over the main rails. Does that make any sense? I
should draw a diagram ...

tom

--
YOU HAVE NO CHANCE TO ARRIVE MAKE ALTERNATIVE TRAVEL ARRANGEMENTS. --
Robin May