The 'crazy' layout at Princes Risborough between the post-Beeching cuts and the improvements of Chiltern's Evergreen programme has to be seen in the light of the withdrawal of all expresses on the Chiltern mainline - all locals either terminating at Risborough, or going through to Aylesbury, and only a limited passenger service north of Risborough stopping at Banbury North only - all other local stations having been closed. Passenger trains could not cross at Banbury as the up loop was not against a platform!
The lines in solid red shown on his diagram were never closed, but served only limited goods traffic to Chinnor and Thame with the odd weekend engineering diversion continuing on north through Banbury non-stop. Cement and coal traffic to Chinnor ceased in 1989 and oil traffic to Thame in 1991 thus when the 1991 photos were taken, very little traffic used the through routes and all passenger trains stopped at the up and down platform 2. The footbridge was demolished and the old down platform abutted only the siding seen disconnected in the photos. When Chiltern Trains reinstated a new down platform - now platform 3 - they did so by building a prefabricated structure over the top of the disused old siding which for many years could be seen under platform 3.
The new footbridge at
PRR▸ was built by M40 Trains/Chiltern Railways and belongs to them - not Network Rail. For passenger access to their new platform 4 at Risborough, the Chinnor and Princes Risborough Railway had to enter an access agreement with the bridge's owners as well as a lease with Network Rail for the land on the west side of the station and South Sidings. The CPRR also lease the old
Princes Risborough North Signalbox seen in some of the photos.
I will see if I can find some various layouts in the public domain. I have some, but they are copyright the
Signalling Record Society.
Today's arrangements can be seen in the LNW (S)
Sectional Appendix on page 209 - about two thirds of the way through an extremely long document.