Brunel's broad gauge measured seven feet and a quarter inch, nearly two feet wider than the standard track that replaced it across a single weekend in May 1892. That conversion closed a forty-year experiment and fixed the alignment that London to Cornwall Train Tour tours still follow. Services leave Paddington, the terminus Isambard Kingdom Brunel roofed in 1854, where three wrought-iron arches still span the platforms. The line west was assembled piecemeal. The South Devon Railway reached Plymouth in 1849, carrying part of its route along a sea wall at Dawlish, laid directly against the Channel. The Cornwall Railway opened to Truro on 4 May 1859, entering the county over the Royal Albert Bridge at Saltash: two lenticular trusses of 455 feet each, held 100 feet above the River Tamar. Its central pier was sunk inside a wrought-iron cylinder floated into the channel and pumped dry. Prince Albert opened the bridge that spring. Brunel, already ill, saw it only from a flat wagon drawn slowly across the span, and died that September. Penzance was linked in 1867, 305 miles from London. Marketing arrived later. In 1904 the Great Western Railway launched a non-stop express from Paddington to Plymouth and asked readers of its own magazine to name it. The winning entry, Riviera Express, borrowed the climate of the Mediterranean for a coastline of granite and gorse. The company published The Cornish Riviera that same year, a guidebook presenting the county as a subtropical province of England, and the phrase held. Branch lines fed the main route: the St Ives branch of 1877, the last broad gauge line built in Britain, alongside the Looe, Falmouth and Newquay spurs that still carry passengers on a Cornish Riviera rail journey. Geography leaves few alternatives, which is why the Cornwall rail route from London still matters. Storms tore out eighty metres of the Dawlish sea wall in February 2014 and severed Cornwall from the national network for eight weeks. A replacement wall, completed in 2023, now stands higher than the original and protects the same four miles of track. The Night Riviera sleeper continues to Penzance, one of only two surviving overnight services on the British network. Beyond Saltash the line runs on masonry viaducts that replaced Brunel's timber originals, their stone piers still visible beside the newer arches. Passengers holding London to Cornwall Train Tour tickets therefore travel a corridor surveyed in the 1840s, across the Tamar and the Hayle estuary, on an alignment that has barely moved since.