[Gremlin]

I know that some intercity trains have power points for commuters to plug their laptops in. There is also WiFi provided free to ticket holders.
If those sockets were solely for the use of cleaners I would think there would be a master switch somewhere to isolate them.
I haven't read the story of the man who was arrested so I won't comment but it does sound, from posts on here, he was being a "plonker".