The video – in Spanish – offers a review of this activities and to us a look to what is behind the exploitation of everyday trains, from high speed to regional.
There’s also a post, on RENFE blog.

“London has the oldest underground transportation system in the world. What happens when the last train has left the station and the escalators stop?”. This was the question raised by Wired popular magazine to introduce a short video report explaining the behind the scenes or better to say “behind the service” populating the London Underground by night. When the last train goes to sleep a team of track workers takes care of the clock’s gears in order to let it work perfectly during the following days.

[video: Wired]