JR East and CSP growing their ‘Mamorail’ system from 57 stations at debut to 244 locations by spring 2018. When child taps standard IC card to pass through ticket gates an update message is sent to parent mobile phone, $4.50 monthly subscription [Jpn] https://t.co/qaSKxBPCYL pic.twitter.com/6x99EmBBBz

— Mobile in Tokyo (@Wireless_Watch) January 10, 2018