Quiz: London Underground

Challenge yourself with the London Underground Quiz which also contains questions about the DLR and Overground services. Each quiz contains a set of 20 questions which are randomly chosen from a super set of 600 questions. You have 15 seconds for each question.
The main objective is to attain a high level of knowledge after each quiz session.
The quicker you answer correctly the more points you acquire.
There are bonus points gained for selecting the correct answers consecutively. There are also penalty points for selecting incorrect answers consecutively.
Enjoy!