"Jack Taylor" wrote

Although they don't use the Greenford branch, the Chiltern services do use
the Greenford shuttle paths between Old Oak West Junction and Paddington,
I believe. Which still doesn't really explain why a Greenford to Ealing
Broadway shuttle couldn't run, as it has in the past.
The Ealing Broadway reversing siding was lifted when the Greenford trains
started running through to Paddington, though I suppose they could reverse
in Acton Yard.

Peter