Princes Risborough railway signal box open day

The UK’s largest surviving Great Western Railway signal box can be found half an hour from central London, and occasionally, it’s open to the public to have a look inside.
The next open day has now been announced.
This is the last survivor of two signal boxes that used to control a complex set of junctions at Princes Risborough, on what is now part of Chiltern Railways. Opened in 1904, it closed in 1991 when signalling control for the whole area was shifted to a modern facility based