Stansted Express
- Services, tickets and information about the shuttle service from London Liverpool street to Stansted Airport.
- https://www.stanstedexpress.com

London Underground
- London's underground railway system. Journey planner, customer information, and the latest news about the Tube.
- http://www.tfl.gov.uk/modalpages/2625.aspx

Heathrow Express
- Heathrow to London Paddington in 15 minutes, every 15 minutes.
- https://www.heathrowexpress.com

Gatwick Express
- Fast rail transit between Gatwick Airport and London Victoria Railway Stations.
- https://www.gatwickexpress.com

Eurostar
- The high-speed passenger train operating between London, Paris, Brussels, Lille, Disneyland Resort Paris and beyond. Fares, timetables and bookings information.
- http://www.eurostar.com

Docklands Light Railway
- Travel, service and tourist information. Trains run from the Tower through to Canary Wharf to Isle of Dogs and Greenwich.
- http://www.tfl.gov.uk/modalpages/2632.aspx

Arriva
- Arriva is one of the largest bus and train transport services organisations in Europe, employing some 34,000 people and delivering more than one billion passenger journeys across nine European countries every year.
- http://www.arriva.co.uk/

Renaissance Trains
- Promotes and invests in "open access" passenger and freight rail businesses in the United Kingdom.
- http://www.renaissancetrains.com/

Grand Union
- Railway company plans to offer passenger trains into West Yorkshire from London Euston via the West Coast Main Line (WCML).
- http://www.grandcentralrail.co.uk/grand_union.html

Wrexham and Shropshire Railway
- Open access rail operator planning to start rail services from Wrexham via Shrewsbury, Telford and Wolverhampton to London Marylebone from June 2007.
- http://www.wrexhamandshropshire.co.uk

Grand Central Train Services
- Company explains its plan to offer high-speed train service from London Kings Cross to Sunderland by way of York, Thirsk, Northallerton, Eaglescliffe (for Middlesbrough) and Hartlepool.
- http://www.grandcentralrail.co.uk/

Southeastern Trains
- Passenger train operating company runs train services in Kent, South London and parts of East Sussex. Includes timetables, fares, and corporate details.
- http://www.southeasternrailway.co.uk/

Caledonian Sleeper
- Overnight sleeping car train services operating between London Euston and Scotland.
- http://www.firstgroup.com/scotrail/content/caledoniansleeper/

First Great Western
- Train services run on the lines between London Paddington, South Wales, the Cotswolds and the West of England. Tickets can be purchased online and timetables are available, along with company news and real-time travel information.
- http://www.firstgreatwestern.co.uk/

First Capital Connect
- Provides fast and frequent cross London rail services from Bedford through to Brighton. First Capital Connect operates trains between London, Brighton, Bedford, Peterborough, Cambridge and King's Lynn. Formerly Thameslink Rail and Great Northern.
- http://www.firstcapitalconnect.co.uk/

South West Trains
- Operates trains from London Waterloo station to the South West regions. Site allows users to buy tickets, look at timetables and learn more about the company.
- http://www.southwesttrains.co.uk/SWTrains

TransPennine Express
- Operates passenger train services across the Pennines in the north of England.
- http://www.tpexpress.co.uk/

Heathrow Connect
- Passenger train service connects local stations. Hayes and Harlington, Southall, Hanwell, West Ealing, Ealing Broadway, and London Paddington with Heathrow Airport. Includes timetable and fares.
- http://www.heathrowconnect.com/

Northern Rail
- Operates local and inter-urban services in the North and North East of England.
- http://www.northernrail.org/

One
- Train service information for East Anglia and services between London Liverpool Street, Colchester, Ipswich and Norwich. Formerly Anglia Railways.
- http://www.onerailway.com/

First ScotRail
- Operating local and long distance services around Scotland, and the Caledonian Sleeper services between London and Scotland.
- http://www.firstgroup.com/scotrail/index.php

Southern Railway
- Operators of the rail franchise that covers the south London Metro area, London to Brighton, plus the south coast between Bournemouth, Brighton, Hastings and Ashford. Formerly South Central Trains.
- http://www.southernrailway.com/

Merseyrail
- Merseyside's passenger rail operator, with full journey planner, real-time status/disruption alerts, and news about the company, planned improvements to the network, and special events that can be reached by train.
- http://www.merseyrail.org/

Go-Ahead Group
- UK company operates train and bus services under several franchises and brand names.
- http://www.go-ahead.com/

Direct Rail Services
- National rail freight operator serves the nuclear fuels industry and other customers in the United Kingdom.
- http://www.directrailservices.com/

Freightliner Limited
- Freight railway in UK provides both intermodal transport and "heavy haul" services for commodities.
- http://www.freightliner.co.uk/

Silverlink Train Services
- Operates trains between London and Birmingham, as well as Silverlink Metro, a suburban route running through West, North and East London. Site offers train times, services and information about the company.
- http://www.silverlink-trains.com/

GB Railfreight
- Freight train operator handles marine containers, commodities and merchandise. With press releases, vision statement and photos of locomotives.
- http://www.gbrailfreight.com/

Association of Train Operating Companies
- Industry association advocates on behalf of its member companies and provides them with shared marketing, accounting and operational services.
- http://www.atoc.org/

Arriva Trains Wales
- Trains in Wales and the borders. Site contains a journey planner, news and information about promotions, engineering work and stations.
- http://www.arrivatrainswales.co.uk/

c2c
- Rail services for London, Tilbury and Southend. Timetables, ticket sales, journey planning and news of events feature on the site.
- http://www.c2c-online.co.uk/

Island Line Online
- Operator of the eight and half miles of passenger railway on the Isle of Wight, serving Ryde, Brading, Sandown, Lake and Shanklin.
- http://www.island-line.co.uk/

NI Railways.
- The public transport service provider for Northern Ireland.
- http://www.nirailways.co.uk/

Midland Mainline
- Operates from Yorkshire and the East Midlands to London St Pancras. Includes ticket booking, fares and timetabling information.
- http://www.midlandmainline.com/

Heart of Wessex Railway
- Information from the Bristol to Weymouth Rail Partnership, made up of Wessex Trains and the 10 local authorities through which the line runs.
- http://www.heartofwessex.org.uk/

English Welsh & Scottish Railway
- The UK's main railfreight operating company. Site includes company information, news and job opportunities.
- http://www.ews-railway.co.uk/

Great North Eastern Railway
- Rail transport from London (Kings Cross) to the North east of England and Scotland. Online ticket booking, route and company information are available on the website.
- http://www.gner.co.uk/

Chiltern Railways
- Operates trains between London, Birmingham, High Wycombe and Aylesbury. Site offers rail information, train times, ticket sales and places to visit en route.
- http://www.chilternrailways.co.uk/

Central Trains Limited
- Local and long distance services across central England. Maps, timetables, tickets and company information is available.
- http://www.centraltrains.co.uk/

Hull Trains
- Direct London to Hull service. News, timetables, information.
- http://www.hulltrains.co.uk/

Virgin Trains
- Timetables online, e-mail booking, business travel, ticket types and fares, train times for Virgin Trains.
- http://www.virgintrains.co.uk/