While I hope that Spanish politics continue to be based in coalitions, this is a very recent phenomenon, with a two-party political system historically dominating the country's politics, a tradition that predates the democratic system itself. [1]

For what it's worth, I believe the plan is to keep most of the land that was purchased for HS2, as to make it possible for the project to be restarted at a later date.

[1]: https://en.wikipedia.org/wiki/Turno