EMO Reset Button on the Tube

Is this button for when staff on the London Underground feel themselves going a bit goth? Or for when they see too many Emos on the Tube?


This photo taken by Rhys Isterix got me and a lot of other people on Twitter, thinking. Someone must know what it's really for. So please let us know otherwise I'll just have visions of seeing a Punk reset button, or an Indie reset button at certain stations on the network.