Road. But living in London also have no immediate access to Cornish libraries! Best wishes, Chris. Many thanks Chris
Also, further to this Roger Winnen has discovered that if you go to Historical Maps Oldmap,co.uk and give the location as Truro you can work along to the site of the junction at Milepost 291and 35 chains.
There is a copyright picture of what is probably Bodinnick Signalbox in 'Cornwall Railways - A Pictorial Survey' by Tony Fairclough. The picture is number 83 on page 54. The caption reads 'near Gwinear Road' and should read 'near Grampound Road'.
Also a rapid response from Roy Hart (Rangoon) who wrote - Dear Keith,
In response to the enquiry today: Bodinnick siding was provided by the Cornwall Railway to serve an iron mine, on the up side, between Fal and Coombe viaducts. The mine was owned by two brothers, who signed the private siding agreement. The siding disappeared in the 1880s, but the box stood (used by pw or bridge gangs, one assumes) until the late 1950s. A photograph appeared in one of the rail picturebooks published by Bradford Barton in about 1975. The title I forget ( 'GW Steam in Cornwall' or some such). The caption describes it as a disused box near Gwinear Road (Barton's books often contained such errors). The building was known to local railwaymen as the 'glasshouse'. I doubt of Bodinnick was a signal box in the modern sense, but facts are hard to come by. The line was broad gauge, single track, of course. Roy Hart
Footnote, it is nice to see our website being used as a reference point - thanks to all.