Geograph - photograph every grid square

The old railway company that built the lines to connect London to Wales and the South West. Isambard Kingdom Brunel (see TQ3080 : Statue of IK Brunel) designed and built much of the route between London and Penzance. Link
Between Exeter and Plymouth is the Riviera Line Link

The South Devon Railway sea wall is situated on the south coast of Devon. It is probably the most photographed section of railway in the United Kingdom as a footpath runs alongside the railway between Dawlish Warren and Dawlish, and another footpath forms a continuation to the sea front promenade at Teignmouth. Both these form part of the South West Coast Path.
The South Devon Railway was built to the designs of Isambard Kingdom Brunel. The Great Western Railway (GWR) and Riviera Line combine to use the sea wall.
Wikipedia: Link

The Riviera Line is a railway line that links the city of Exeter with the "English Riviera" resorts of Torbay. It is linked with the Exeter to Plymouth Line (Great Western Line) with which it shares the route along the South Devon sea wall. It is part of the Network Rail Reading to Penzance route.
Wikipedia: Link