It should be mentioned here that in the case of Madrid, the metro is managed by a rightwing party who intentionally reduced the amount of trains when the car restrictions started, in order to cause discontent. See https://www.publico.es/politica/madrid-central-arranca-madri... (sorry for the link in Spanish).
I’ve tried going over the article and cannot find any mention to any right-wing party intentionally reducing the amount of trains. I should disclose that Spanish is my mother tongue.
If anyone wants to pour over the article and explain it to me: EMT is the TfL of Madrid, Mayor's office is left-wing, Regional government is right-wing.
Sorry, the article doesn't mention that the regional government is right-wing (my fault), but it does say this: "Sin embargo, en lugar de reforzar el servicio, como prometió hace un mes el presidente del Gobierno regional, Ángel Garrido, la frecuencia de los trenes se ha visto mermada".
If anyone wants to pour over the article and explain it to me: EMT is the TfL of Madrid, Mayor's office is left-wing, Regional government is right-wing.