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Great Britain's rail network is one of the busiest in Europe, with over 1.7 billion journeys made annually. The network is operated by multiple franchised train operating companies (TOCs) under Network Rail infrastructure. Major operators include Avanti West Coast (London to Manchester, Liverpool, Edinburgh), LNER (London to Edinburgh, Leeds, Aberdeen), GWR (London to Bristol, Cardiff, Cornwall), and Southern/Thameslink for London commuter services. High-speed services reach up to 200 km/h on the West Coast Main Line and East Coast Main Line, though a true high-speed network (HS2) remains under construction. Eurostar connects London St Pancras to Paris in 2h15m, Brussels in 1h51m, and Amsterdam in 3h41m through the Channel Tunnel. Domestic booking opens 12 weeks in advance; advance fares -- fixed to specific trains -- offer the best savings, often 50-70% below the walk-up Anytime fare. The Railcard scheme offers one-third off most fares for young people (16-25), seniors (60+), disabled passengers, and families. A Travelcard or contactless payment covers unlimited travel within London's zones. Northern Ireland has a separate rail network operated by Translink (NIR), not connected to the Great Britain network. The BritRail Pass is available to non-UK residents and covers all National Rail services. For planning, National Rail Enquiries and the Trainline app provide comprehensive journey planning and booking across all operators.