We also went on quite a few underground trains called Tubes. The London Underground is the world's oldest public underground railway. C loves it and so did the Stanleys as it can be very wobberly!http://www.afn.org/~alplatt/tube.html The map may look compicated but it does make getting round London very easy and fast. The escalators can be very long as they are a long way underground! We then came home happy and exhausted!