Some Tokyo Train Facts:

The busiest train line in Tokyo?
Shinjuku Station which is not just Tokyo's busiest station, but the busiest railway station in the world, with almost 3,650,000 passengers per day

The oldest Train Line in Tokyo:
Ginza

How many train stations are in Tokyo?
There are 503 stations across the 23 wards of Tokyo. Ironically, given its importance to emerging Japanese fashion,

The oldest station in Tokyo?
Shinagawa - June 12, 1872, but Harajuku has the oldest station building in Tokyo.                   

Deepest underground Station in Tokyo?
Roppongi Station, which is 42 metres below sea level

How many subway Lines in Tokyo?
There are 13 subway lines, operated by two companies.