How usual is it to have a “disturbed” gps-signal around Russia?

I was near the russian border to Kaliningrad in Lithuania in the summer and 2 of our 4 GPS-devices were “all over the place” on that day. Constant location-jumps, sometimes no location at all.

Thats a good one. Do you have horizontal traffic lights, or what is the connection to the red light?

True. That’s a flaw with the english words.

Yet the exit would always be on the stationboard side (left or right). So you would never know which side of the train to exit.

I’m not sure. It has always been done like this here.

I think it’s just a convenience thing. Might be useful in crowded trains, so people know which doors they should not stand in front of.