"the collision occurred after one train stopped on the line unexpectedly due to an Automatic Warning System fault causing it to brake. It was then hit from behind by the second train that had passed a red stop signal protecting the stationary train in front"

- Not Spain. This was Bedford (UK) in June 2026.

https://en.wikipedia.org/wiki/2026_Bedford_train_collision

The train collided rear-end into the rear carriages of the other train and derailed, which also resulted in the three rear carriages of the first train to derail

- This was Białośliwie train collision (Poland) in June 2026

https://en.wikipedia.org/wiki/2026_Bia%C5%82o%C5%9Bliwie_tra...

One carriage was reported to have overturned and four more were derailed. 44 of the passengers were injured

- And this was the Cleon Derailement (France) by sabotage in September 2026

https://en.wikipedia.org/wiki/Cl%C3%A9on_derailment

In this last case Police suspected sabotage after a 300 Kg piece of rail was found deliberately laid in the railway.

"A fire was detected in the rear cabin of the high-speed train. Following safety protocols, the 283 passengers on board have been evacuated"

This was an AVE passenger train in the line Madrid-Barcelona, in October 2026. Most probably another case of sabotage.