Forum Topic

Yet again, one of the double act of Francis Rowe and Andrew O'Sullivan jump in to defend bonkers statements made by the other.  Shouldn't you be telling your mate Andrew that he is nuts thinking a ramp is viable?So Francis, if you think that the maximum depth required is 5.5m, let's say the foot tunnel is of height 2m (which means anyone over 6ft 5in needs to duck), are you assuming that the roof of the foot tunnel would only be 3.5m below the floor of Chiswick Park?The loading gauge requirements (so the height of the District line tunnel) for S stock trains is a minimum of 4m on its own, then add to this the distance between the roof of the train tunnel and the floor of Chiswick park, and how far below the train line a foot tunnel would need to be and the height of the foot tunnel... my estimate of 15m is certainly better than yours which would have the foot tunnel in the middle of a District line train.The height of a bridge over the crossing on Bollo Lane would only need to be the aforementioned 4m for the train loading gauge. The entire width of the road plus some distance on the road either side of the crossing would be available for the ramp switchbacks and landings.Plus, the incentive for a bridge over the train line is it would be impassable otherwise assuming a crossing is closed for West London Orbital.Some people appear to think that the zebra crossing on Acton Lane is impassable and a tunnel is needed, but it really isn't...Planning gain for the site would be better spent on accessible access for Chiswick Park itself plus improvement of the pedestrian access on the surface routes to the station.  Not a bonkers tunnel.Still, it serves to illustrate the lack of analytical thinking from some of the brains trust who post on this forum.

Michael Robinson ● 13d