The route is as follows
East Japan Passenger Railway: Yamanote Line, Tohoku Line and Changpan Line.
Beijing-Chengdu electrified railway: Beijing cost line
Tokyo Metro Construction: New Traffic in the Dawn? People's line: under construction
As for the name, you think too much, which has nothing to do with this poem.
Until the middle of18th century (during the insurance period in Japan), the name of this place was Shindig (later, it was declared as "a place where you will never get tired of spending a day here", and its name is now changed to "Dusk".