Britain has got the oldest railway system in the world. It began in the 1840s. the main railways connect London to other cities in Britain. Like many large cities, London hasn't got a central station. This is because different companies built the railways, and they all had their own station in London. Victoria an Waterloo, for example, are the stations for trains to the south.
If you want to go to the west, however, you have to go from Paddington. Today Britain hasn't got a national railway company. Instead, over 20 private companies run the trains.