> Building a 73 mile train line through some of the most expensive real estate in the world Apart from the 13 miles of tunnel in the middle, pretty much the en

> Building a 73 mile train line through some of the most expensive real estate in the world Apart from the 13 miles of tunnel in the middle, pretty much the entire above-ground train line existed already, so it's not a fair comparison -- the need for real estate purchases for Crossrail was comparatively very small.