“Budget escalation: The initial budget was €37 million, but the final cost has grown to around €480 million.”
Astounding though it is it sounds like it may have been stone souped.
One hundred kilometers from there, there is this station: https://en.wikipedia.org/wiki/Li%C3%A8ge-Guillemins_railway_...
by the same architect, and budget exploded as well...
So either local governments or Calatrava is messing around :-/