At the end of each carriage, there are doors that can be opened by pressing a button and waiting for 2 seconds. The picture showing how to use these doors are here:
The doors are generally stiff and akward to open. However the bit I'm confusd about is the picture that flashes above the doors:
It's a no entry sign. It doesn't seem to bare any issues though, as both doors work and can be operated (After the 2 second delay). This random sign just flashes away and doesn't seem to indicate anything. Does anyone know why it's there and what it signifies in this context?
A side note, you have to go through these doors to access the public toilets. These doors are in every carriage, but a toilet could be up to 4 carriages down the train. It seems strange they'd have a no entry sign, yet they'd be asking you to go through the doors to get to the toilet