The sign has the English words "Transition overground" and a pictograph of a man climbing stairs. What would this sign mean to you if you found yourself near a foreign railway?
It means my train to Vladivostok is leaving from platform 2 in 10 seconds.
I would assume that the sign means "Stairs to Platform
I would further assume that there is another sign showing a pictograph of the considerable carnage involved in crossing the tracks by jumping onto the lines with a big red circle and a line struck through the heart. But I'd still take the short cut.