The system of rail transport was invented in England and Wales, so the United Kingdom has the oldest railway network in the world. It was built mostly during the Victorian era. At the heart of the network are five long-distance main lines which radiate from London to the major cities and secondary population centres with dense commuter networks and highs-speed lines in the regions. The newest part of the network connects London to the Channel Tunnel from St Pancras station. The system of underground railways in London, known as the Tube, has been copied by many other cities.
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