It's Not Just Me

The Yamanote Line is a fan favourite. One of the bloggers I enjoy has also expressed his love for the green train here:

The Yamanote is a loop urban line in the center of Tokyo with 29 stations. The Imperial Palace is in the center of the loop.
It is the busiest line in the world.
It is used by an average of 3.6 million passengers a day. Some busy days more than 5 million people use Yamanote trains to move around Tokyo.
Some days, the Yamanote line (With only 29 stations) transports more people than all trains and lines in the New York metro system (nearly 500 stations and 26 lines).
Yamanote started in 1885. It is one of the oldest urban trains in the world..
During rush hour, in a station, one train stops every two minutes.
There are videogames only about Yamanote
It takes around 60 mintues to do the whole loop.
Yamanote trains have 11 wagons. Some of the wagons have 6 doors and some have 8 doors. Some trains have 88 doors!.
On top of each door there are two LCD screens. That means that there are 176 screens per train! The maximum speed a Yamanote train can travel is 90km/h.

A whole host of pictures can be found through the link.