https://pedestrianobservations.wordpress.com/2013/06/03/comparative-subway-construction-costs-revised/ https://pedestrianobservations.wordpress.com/2013/06/03/c

https://pedestrianobservations.wordpress.com/2013/06/03/comparative-subway-construction-costs-revised/ https://pedestrianobservations.wordpress.com/2013/06/03/comp... Not exactly Tokyo, but in Seoul between $43m/km and $87m/km, Hong Kong $586m/km, Singapore $600m/km.