On Fri, 16 Mar 2007 17:31:19 -0400, David of Broadway
wrote:

Most of the compromise height locations have subsurface trains on one
track and tube trains on the other -- if one of the tracks were raised a
bit and the other lowered, the problem would be largely solved (except
when trains are rerouted to the other track). But that still leaves
Uxbridge through Rayners Lane and Ealing Common.

And Acton Town, where Piccadilly Line trains use all four platforms.