The Tube (that's London-speak for subway) workers were on strike a while back to prevent a driver from getting fired for something as petty as blowing past four red signals. That made some people upset. A couple of medical doctors were upset enough to put this together. Enjoy! (Warning: Includes plenty of foul language. And if you're curious by the time the song is over, here's what an Oyster card is).
[Hat tip to Jason Song]