Americans, a subway is not a subway. If you go down some stairs next to a sign that says SUBWAY, you are simply going to go under a street and back up to the other side of it. You are not going to catch the next train to Piccadilly Circus. If you want to get a train to go there, look for the London Underground sign. Of course. subway tunnels under streets are a very good idea because the British drive on the wrong side of the road!