a major Japanese public transport artery.
Runs from Otsuki to Yotsuya, in and near the Tokyo area (maybe further - I cant tell from my map), in the surface train capacity.

Most famous for its "peak hour" (read: sardines in a can) congestion, its inappropriately groping salarymen, and its popularity as the train to end it all in front of.
The later, perhaps, because of the frequent express services running along the line.

a colleague of mine once stated that his train (on the Chuo line) was delayed every day for over a week due "unforeseen circumstances" (read: salarymen ending it all).