In the weekend 16/17 September, Reading Station will be
closed for electrification work. Trains from Paddington to
points west will travel via Greenford and the Wycombe Lines,
the Chiltern main line and Bicester spur, and Oxford.

Presumably that level crossing at Bicester Village Station will
be busy and will cause major hold-ups to road users. I doubt
the locals will be amused!

I'm sure there will be a lot of railway photographers at Castle
Bar Halt and South Ruislip that weekend.