Wow, I thought Amsterdam's new metro line (Noord/Zuidlijn) was extremely expensive because it's way over budget, Amsterdam was built in a swamp and there was da

Wow, I thought Amsterdam's new metro line (Noord/Zuidlijn) was extremely expensive because it's way over budget, Amsterdam was built in a swamp and there was damage to rows of houses etc. But it's 9.7km, originally planned at 680 million euro, now estimated at 3.1 billion euro (project started in 2009, currently expected to be completed in 2018). That works out to $360m/km or so, not that bad compared to the worldwide average.