St. Austel signal box is a 1906 GWR Type 7C structure dating from 1906. When I took this photograph in 1981 it had been closed for a year thus creating a block section between Par and Burngullow. Interestingly, by pure chance during my last visit to the area in 2017 I stood in what was a very similar spot to take a photograph replicating this one, see....
https://www.ontheupfast.com/p/21936chg/24717826404/st-austell-signal-box