I'm not really sure what this is. Maybe it is some kind of an electrical unit, or access for the train. Maybe there is some danger involved in opening this. Like a possible electric shock, an alarm going off, or neglected spider web and massive spider waiting to bite you.
However, I am pretty sure that the sticker on the front is not correct:
Unless there is someone hunched inside, waiting to tickle the next unsuspecting person to open up that door, this is what we call MISREPRESENTATION.
Other examples of misrepresentation:
When people call black licorice "yummy."
When people call Shrek "funny."
When people call porn "normal."
When people call the man bun a "good fashion choice."
Don't fall for misrepresentation.
If in doubt, don't eat black licorice, don't watch Shrek, don't look at porn, and don't wear a man bun. Follow this advice and already you're ahead in life.