On Tuesday, news broke that the new Crossrail route through central London is going to be named after the Queen as the 'Elizabeth line'.
This made a lot of people unhappy, many of whom said the Jubilee line was already a thing and enough is enough, as well as one American woman called Elizabeth Line who is understandably getting a lot more attention now.
Others were made very happy at the pun potential.
Regardless, there's going to be a new tube line and a new colour, on an already dense London Underground map.
So now is as good a time as ever to put your Tube knowledge to the test - can you match the lines to the colours?
Take the quiz, below, and let us know how you got on in the comments: