The North Wales Coast Line (), also known as the North Wales Main Line ( or ), is a major railway line in the north of Wales and Cheshire, England, running from Crewe on the West Coast Main Line to Holyhead on the Isle of Anglesey. The line has 19 stations, with all except two, Chester and Crewe, being in Wales. The line is not currently electrified, so Avanti West Coast, the current operator of the West Coast Partnership franchise, currently uses Class 221 Super Voyagers, which they have done since December 2007, on routes to Holyhead. The line contains several notable engineering structures, including Conwy railway bridge across the River Conwy, and Britannia Bridge across the Menai Strait. History The first section from Crewe to Chester was built by the Chester and Crewe Railway and absorbed by the Grand Junction Railway shortly before opening in 1840. The remainder was built between 1844 and 1850 by the Chester and Holyhead Railway Company as the route of the Irish Mail services to Dublin. The line was later incorporated into the London and North Western Railway. Between Chester and Saltney Junction, the line was, from the start, used by trains of the Shrewsbury and Chester Railway, later to be incorporated into the Great Western Railway. So important was the line in the 19th and early 20th centuries to passenger, mail and freight traffic between Britain and Ireland that the world's first experimental and operational water troughs were installed at Mochdre, between Colwyn Bay and Llandudno Junction. Their purpose was to enable steam engines (especially on the Irish Mail) to collect water without stopping. Later, considerable stretches of line between Chester and Colwyn Bay were quadrupled to increase line capacity, but these sections have now been reduced to two tracks. Modern day In 2018, a £50 million signalling upgrade programme was completed between Shotton and Colwyn Bay. This upgrade saw modular colour lights supervised from the South Wales Rail Operating Centre in Cardiff replacing the manual signal boxes and mixture of semaphore and older colour lights. Main calling points The places served by the route are as follows: Crewe Chester Wirral Line diverges to serve Birkenhead and Liverpool (Merseyrail) Line diverges to serve Wrexham, Shrewsbury and Cardiff (via the Shrewsbury to Chester Line), and Manchester, Warrington and Runcorn (via the Mid-Cheshire line and Chester–Warrington line). Shotton The Borderlands Line connecting Wrexham to Bidston