Coach Lights On Ice 1

Hi,
I've been playing the new German route for a while and I've been trying to understand how to turn on the coach lights for the ICE 1.
I've looked everywhere (all of the screens, behind the driver's seat, ecc.) but I didn't find anything useful.
Does anybody know how to turn them on?

 

They are on automatically and are only really visible in the dark.
In reality they are switched on from within each coach and not the cab

 

i heard the turn on automatically... i look later maybe i find a button in one of the coaches

 

Thanks. Even if they should turn on automatically, I run a service where the lights were off (maybe it was a bug).