Many Years before Centurion Way became a wonderful footpath/cycleway it was the Chichester to Midhurst railway line
The last passenger train was run on the last section of the LB&SC Chichester – Midhurst railway, the gravel line to Hunters Race , in 1981 by heritage railway enthusiasts who were working to take over the line up to Lavant and eventually the line to Midhurst.
They also organised a walk along the line of the railway, as far as possible, from Lavant to Midhurst including the Singleton tunnel with a return journey by open top 1920s bus.
http://screenarchive.brighton.ac.uk/detail/7194/
Many thanks to Mike Chires for information and link to video. couple of videos
Other videos of railway operating between Chichester and Lavant are available on YouTube.