"Matthew Geier" wrote in message
...

So on 'environmental grounds' they want the more capable and
efficient over head system replaced by an inadequate and possibly
dangerous ground level system.


I think you are missing the factt that it really is only a very short
extension to an existing third rail system if they ran third rail into the
T5 basement - and there can't really be much of a 'technical issue' given
the neighbouring LU tracks for the Piccadilly. Staying with third rail
would mean the TOC (SWT or successor) wouldn't need a sub class of dual
voltage rolling stock, so there would be advantages in terms of train
diagramming.

Paul S