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Vibrations/stresses on the bridge structure I would see as the major issue.  An enclosed bridge might mitigate ice danger - I would be v. surprised if much ever formed on moving or even still rotors at prevailing temperatures over the Irish sea.  It was the length of tunnel issue - with the attendant safety, fire, and ventilation issues which I was trying to address by raising bridge option.

As you say - cost is ultimately a Government decision, but I would see it as v. likely to be totally unaffordable for any Irish Government in the foreseeable future especially when the cost of upgrading rail infrastructures on both sides of the sea are taken into account.

Are there any general studies/macro-comparisons available of the relative CO2 emissions of building and operating rail networks (with large tunnel components) compared to other modes of mass transportation?

notes from no w here

by Frank Schnittger (mail Frankschnittger at hot male dotty communists) on Sat Dec 19th, 2009 at 08:18:39 AM EST
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