Tokyo can't be managed without a railroad.
The number of people living in Tokyo or coming to Tokyo every day is insane.
Only in Shinjuku station, the most cloudy station in the world, passengers getting on and off per day is near 2.500.000 million.
But Tokyo changes so quickly that there are few abandoned railroads. There is this place where a track is left.
This pic shows you the Harumi bridge used before by train and until 1989.