alt Hacker NewsNot impossible, but they did have to deal with gas leaks and a WW2 grenade, and this is a rail bridge on an actively used line.
Still, there's an undeniable sense of "why is this more expensive to replace than it was to build in the first place?" with a lot of infrastructure in the modern world.
Some firms prebuild bridges and slide them in. 20-30% more expensive apparently but a lot faster. Lets say $2M by quading it. Gas line is a nothinger, they would need to shut it down and reconnect it anyways. Grenade removal, they do it in war zones and it is not that expensive in my opinion.