chunky munky wrote:

Trials were carried out a few months back after close of traffic with
a 67TS with polystyrene strips on running on the Piccadilly to
Finsbury Park Victoria. I don't know the outcome though!

How primitive. Just because a train fits through once doesn't mean it will
fit through every time, especially with varying numbers of passengers in
varying distributions, and the new trains will have different suspension to
the old ones anyway. Has LU not heard of lasers and proximity sensors and
computer modelling?