Crossrail And The Channel Tunnel Rail Link Compared
The differences between the ventilation and access shafts in Crossrail and the Channel Tunnel Rail Link seem to be more than you would think.
Those in the newer tunnel appear to be smaller and possibly lesser in number. Certainly after a redesigned Crossrail abandoned eight further shafts, which must have been a substantial saving.
Perhaps too, as Crossrail has stations in its tunnels under London, the number of shafts can be reduced.
If you look at the pictures of the five Channel Tunnel ventilation shafts, you will see a series of brutal brick towers more equivalent to Napoleonic War defence installations, than anything built in this century. None of those for Crossrail have yet been built, but they seem to be innovative structures that enhance rather than confront their environment. This page on the Fereday-Pollard web site shows a few concepts. I particularly like this visualisation of the concept for the ventilation shaft in Mile End Park.
Mile End Park Ventilation Shaft
This is another almost cheeky concept from this page on the Acanthus Architects web site.
Crossrail Ventilation Shaft By Acanthus
This Google Earth image may show the location of this ventilation shaft.
Ranelagh And Westbourne Bridges
The shaft is above the Royal Oak portal by the elevated A40 Westway between Ranelagh and Westbourne Bridges over the Great Western Main Line into Paddington station.
I think it all points to Crossrail 2 being simpler still! But then with my experience of watching projects for many years, as each version of a series of similar projects gets implemented, the engineers and managers ratchet up the design quality, speed of construction and efficiency.
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The Anonymous Widower 
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