Many years ago , under Crossrail 1 (RIP) , we had a good hard look at the Thames branches east of Reading to see what synergy there was for either wiring or service enhancement (I was so naive then - but it was long pre RUS , and it was I suppose strategic thinking)
Surprise , surprise - Greenford was the very weakest - and in those days it trundled into Paddington , giving a nice empty train to the grateful populace of Ealing Broadway. As you can imagine the misuse of a valuable path into Paddington was highlighted even before HEX..
The recommendations were "bin it" (something like 4 parallel buses in the area then) , try and get LUL as it was to take it on , or a damage limitation excercise by making passive provision at West Ealing for a bay, under both resignalling and electrification (making sure there were no awkward OLE etc equipment in the way) , and making space in the then underused up sidings / loops at the latter for a possible turn back for Crossrail.
Binning was a "no-way" , LUL would have run a mile - and the damage limitation plan eventually happened.
Come the Parliamentary Bill Enquiry into Crossrail 1 , one of the opponents specifically raised the Greenford - Paddington as an indication of how sparse (then !) traffic was on the West side of London and how the bill should be dropped.
It was of course , but there were other factors in play.....