That's somewhat unfair comparison - most of the length of track already existed above ground and didn't need a lot of work There's 10 new stations and about 40

That's somewhat unfair comparison - most of the length of track already existed above ground and didn't need a lot of work There's 10 new stations and about 40km of tunnel (20km each way) That said the tunneling cost alone came out about £30m per km, so about $65m per mile.