In message , at 19:15:46 on Thu,
15 Feb 2007, Clive Coleman. remarked:
Turning off perhaps, but earthing it down might take a little longer.
How about the SCDs in all the cabs?

Bootstrapping problem! If it's too dangerous to be out on the track
because it's 3rd/4th rail, then surely it's too dangerous to be out on
the track with an SCD - even though that's in order to make it more
safe.

(I'm assuming here that existing 3rd/4th rail tracks have grandfather
rights regarding this issue, and of course that the issue is a real one
in the first place, rather than just a rumour).
--
Roland Perry