"JohnLon" wrote in message
news:5d926a67-1f9c-4dab-b7a1-

Thanks for the comments and information. The road bridge crossing over
Feltham station platforms is not very high or wide, so using that end
would probably need a new bridge.(Expensive) There have been rumours
for some time that the level crossing might close to road traffic
(cheap) so that could be the solution that is eventually adopted. Time
will tell.

Information in the Jun 11 update to the Network Rail CP4 enhancement plan:

"Note 3 Extending Feltham platforms at the country end will require closure
of the level crossing.
Extending them at the London end will impact on the entrance to any
potential new depot. Further
development work will be needed before a firm decision can be made at this
location. The interim fallback
position would be the use of SDO."

AIUI that might be out of date because they originally had Feltham yard
earmarked for a new depot mainly for Airtrack and
some other SWT fleet expansion...

Paul S