To add, a large amount of freight west of Exeter has been lost since the 1990s. What remains are occasional Alphington spur scrap metal trains, very occasional MOD trains to the depot on the first stretch of the Gunnislake line (sorry, can't think of its name, Ernesettle?), the Moorswater cement, the china clay workings around Fowey and Burngullow etc. and china clay trains north beyond Exeter (saw one last summer). For a while we had the timber trains from the Heathfield branch but sadly the Dawlish seawall collapse put paid to those, and they were switched to Exeter. The rest are all related to track renewals, such as aggregates.
Lost were the regular Meldon aggregates flows, the bitumen, china clay and scrap metal flows to Plymouth and fuel trains down to Penzance (thanks
GWR▸ 
) and also china clay and fuel oil workings on the Heathfield line (I'm sure there's more). Its a bleak picture when you consider that in the early 80s the Barnstaple branch alone carried china clay, cement, timber, chemicals and fertiliser freight (and milk tanks until the 70s).