Spanish train crash

" said:

Why was that camera there? It's been mentioned as a "security" camera, but to secure what? It seems to be the only camera in the vicinity, and it's pointing directly along the tracks, not at the bridge or the walls with the graffiti.

Might it be a "speed camera"? To actually observe the speed of trains around that curve. "Security" might have a different meaning before translation from Spanish. Eg., a "Monitoring camera" might be a "Security camera".