
[quote="Japan Today"]SAITAMA —]
http://www.japantoday.com/category/crime/view/man-held-for-punching-50-yr-old-woman-on-train-in-saitama-over-playing-gameson-cell-phone
I wouldn't imagine there would be elbow room enough to break someone's jaw on the Saikyo line during rush hour, but there you have it.