The Mainland (RWS)

The United Kingdom of Great Britain and Northern Ireland, also known simply as the United Kingdom, is The Mainland of Sodor, accessed via the Vicarstown Bridge. It constitutes of four countries: England, Scotland, Wales and Northern Ireland. It also consists of many small islands, such as the Isle of Man.

Location
The Mainland (United Kingdom) is located across the Walney Channel from Sodor and is accessed via the Vicarstown Bridge. Barrow-in-Furness is the nearest Mainland station and town to Sodor. Sodor itself bridges the bay between Barrow and the Isle of Man, reducing what would otherwise be a swath of open sea into a narrow strip of water named Faarkey-Y-Sudragh ("Sudrian Sea").

Named Locations
Certain locations on the Mainland have been mentioned by name in The Railway Series with some areas even making appearances. These include:

Barrow-in-Furness

 * The Eight Famous Engines - Percy Takes the Plunge and Gordon Goes Foreign
 * Duck and the Diesel Engine - Domeless Engines
 * Enterprising Engines - Escape
 * Gordon the High-Speed Engine - Fire Escape and Gordon Proves His Point
 * Henry and the Express - Out of Puff

Bournemouth

 * Toby the Tram Engine - Mrs. Kyndley's Christmas
 * Thomas's Christmas Party

Bristol

 * Duck and the Diesel Engine - Domeless Engines

Carlisle

 * Gordon the High-Speed Engine - Gordon Proves His Point

Carnforth

 * Thomas and the Great Railway Show - Museum-Piece

Crewe

 * Henry the Green Engine - The Flying Kipper  and Henry's Sneeze
 * Enterprising Engines - Tenders for Henry
 * Henry and the Express - Overhaul
 * Thomas and the Fat Controller's Engines - Birdstrike

Doncaster

 * Enterprising Engines - Tenders for Henry
 * Gordon the High-Speed Engine - High-Speed Gordon

Haverthwaite Tunnel

 * Thomas and Victoria - Avalanche

Lake Windermere

 * Thomas and Victoria - Avalanche

Lakeside

 * Thomas and Victoria - Avalanche

London

 * Toby the Tram Engine - Toby and the Stout Gentleman
 * The Eight Famous Engines - Gordon Goes Foreign, Double Header and The Fat Controller's Engines
 * Thomas Comes Home - Snow Problem
 * Henry and the Express - Out of Puff
 * Thomas and the Fat Controller's Engines - Birdstrike
 * Thomas and his Friends - Buffer-Bashing and Gordon's Fire Service

Lydney

 * Wilbert the Forest Engine - Cab Over Wheels

National Railway Museum

 * Thomas and the Great Railway Show - Museum-Piece, Not the Ticket, Trouble on the Line and Thomas and the Railtour
 * Thomas Comes Home - Thomas Comes Home

Norfolk

 * Toby, Trucks and Trouble - Toby's Seaside Holiday

Plymouth

 * Duck and the Diesel Engine - Domeless Engines

Scotland

 * The Twin Engines - Hullo Twins
 * Jock the New Engine - Jock

Skipton

 * Thomas and the Great Railway Show - Museum-Piece

York

 * Thomas and the Great Railway Show - Museum-Piece, Not the Ticket, Trouble on the Line and Thomas and the Railtour
 * Thomas Comes Home - Snow Problem

Railways
The Mainland is home to a number of different railways. The main railway company on the Mainland was British Railways - now split up into various privatised companies - however there are many others which also feature in The Railway Series and associated media. These include:
 * Bluebell Railway
 * Corris Railway
 * Dean Forest Railway
 * Ffestiniog Railway
 * Ravenglass and Eskdale Railway
 * Snowdon Mountain Railway
 * Talyllyn Railway
 * Toby's Old Tramway