Items added on the 15th February 2018 Those added most recently come first.

Tavistock Jct to Tavistock Jct via Penzance
Roger Salter Emma Shard and Roger Winnen

Class 70 70806 ran as the 060Z from Tavistock Jct to Penzance and return, this possibly being a route learning or driver training event in connection with forthcoming engineering events in Cornwall

180215a 70806 Crossing Hayle Viaduct on a driver training run from Tavistock Junction. Copyright Roger Winnen

180215d 70806 Viewed from Marazion Bridge on its run into Penzance. Copyright Roger Salter.

180215c The 060Z The 09.38 Tavistock Junction to Tavistock Junction at Penzance - Copyright Roger Salter

180215e 70806 Passing the remains of Marazion Station. Copyright Roger Salter

180215b Returning from Penzance 70806 is seen from Foundry Square, Hayle. The spar lorry is distributing provisions to The Spar Shop on the corner Copyright Roger Winnen

180215f 70806 Approaching Roskear Junction. Copyright Emma Shard

Oborne
Brian Pibworth

Your news item showing the Thumper at Oborne, Dorset raised my spirits on this awful wet and windy morning and reminded me of a sunny Summer's day back in 2008 when the LSWR main line rang to the sound of pacifics showing their mettle. 
The A4 pictures were definitely taken in, what we call round here, "dimsey" and most of the photo-pack had given up and gone home.  The more intrepid of us just cranked up the ISO setting and hoped "Mallard" would appear soon.  This she did, but after passing under the A30 there was an eruption of steam and noise that made us think she had failed.  Apparently a Network Rail tamper had pumped up the ballast and lifted the rails to a point where there was a risk of fouling the bridge.  I suspect these days there would have been an immediate cancellation of the special, but this time there was just a speed restriction for the bridge.  Having built up a good boiler pressure for the gradient the result of closing the regulator was spectacular and it took the crew some time to regain traction and continue to the crossing stop at Gillingham.  For a full record of the day and views of "Duchess of Sutherland" at Buckhorn Weston and Castle Cary I have appended this link to my Flickr collection https://www.flickr.com/photos/rabbipx/6796604477/in/album-72157629116879415/.
As ever I have no great faith in any of the links or captions working so have written it out for yoiur consideration.  Please shout if you need more.
With kind regards, Brian  Many thanks indeed for three super pictures

Former LNER Class A4 4-6-2 No 60019 "Bittern" slows to walking pace to negotiate tight clearance on the A30 bridge at Oborne, near Milborne Port with the "Locomotive Exchange Special". The railtour commemorated the trials conducted by the newly nationalised British Railways when LNER A4 pacifics 60033 "Seagull" and world record holder "Mallard" ran the A.C.E. route from Waterloo to Exeter. On that occasion the A4s were down to 30 mph at this point but, at the time of this picture, due to raising of the trackbed, steam locos are now restricted to single figures to prevent oscillations fouling the stonework. 1st June 2008 Copyright Brian Pibworth

Oborne. After slowing to negotiate a tight bridge, safety valves blow and the crew of 60019 "Bittern" apply sanders to help maintain grip on the 1: 80 gradient from Milborne Port, Dorset. 1st June 1989 Copyright Brian Pibworth

A classic at Buckhorn Weston as 6233 Duchess of Southerland makes a powerful ascent with 'The Locomotive Exchange' Railtour. 1st June 2008 Copyright Brian Pibworth

Hemerdon
Roger Geach 

Here is 47746 on the 1353 Plymouth - Bristol vans on Hemerdon bank 2 4 1997 , hard to think this was taken over 21 years ago. Copyright Roger Geach.

Exminster
Ron Kosys

A proper HST about to pass Exminster. 6th September 1989 Copyright Ron Kosys

Chard Junction
John Cornelius

Copyright John Cornelius