Clean and spacious stations!
Time schedules! (For those of you who don't know, I miss this greatly since Boston's MBTA offers no time schedule; at least for the line I use)
Beautiful and modern trains! (Something the MBTA lacks as well)
Spacious inside with lots of bars and such to hang on to when it's crowded!
Gotta love love love the train system here in Yokohama/Japan. They offer ultimate convenience as well as a premium experience; I didn't realize this until I started living in Boston. I must have took all of this for granted for 18 years.