The London Underground (the Tube) opened in 1863 and it is the oldest underground railway system in the world. Both the Tube in London and the New York Subway have got more than 400 kilometres of track. The busiest underground railway,homever,is in Moscow,with around three billion passenger rides a year. Moscow has alos got the deepest station with the longest escalators in the world. One escalator mat the city's Park Pobedy station is 126 metres long with 740 steps. The journey to the top take about three minutes!