wow "a quarter of a billion dollars" for that.
My guess is that with modular precast forms, it would be something $500k max!
Somebody pocketed some big amount of cash, I would guess.
Not 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.
It's " a major element of a £237m scheme to upgrade Oxford rail station". Most likely it is more expensive than it should be, but not to that extent