Indeed. You don't have to go far from the tourist spots to see some very deprived areas.
Oh and for anyone holidaying there I cannot recommend highly enough a visit to PK Porthcurno. My wife and kids really didn't want to go but ended up raving about it. It's a really fantastic museum.
Anyway to bring slightly back in topic I can't ever see the Par to Fowey line opening again, but perhaps there's hope for Lostwithiel to Fowey.
Picking up on this, and the point made by bramling above, another good place to visit is the Wheal Martyn China Clay Museum. It is a little north west of St Austell, not far from the Eden Project.
Wheal Martyn shows some of the harsh realities of how china clay was produced, and includes quite a large amount of railway interest too as rail was important to get the clay to the coast for export, and import coal for the pumping and drying. It is possible to leave the car there and walk to St Austell following one of the Clay Trails, which follows the route of the Lansalson Branch (the last branch built by the GWR). Along the way are a number of overgrown railway relics, and hiding in the trees alongside is the remains of Carlyon Farm Dries, one of the largest clay dries in Cornwall. The bookshop at Wheal Martyn included a couple of interesting railway books, and also shipping from Fowey and Par.
Another railway connected place would be to walk around the Luxulyan Valley, and across the Treffry Aqueduct. In the valley below you can follow the route of the original tramroad and go down Carmears Incline, there are stone setts and bits of rail still in situ.
I will look out PK Porthcurno.
cheers