The London Underground is an impressive beast.
More than 1 billion journeys take place on it each year. The longest journey you can take without changing trains is 54 kilometres. Waterloo station alone has over 23 escalators and sees over 100 million passengers per year.
With that in mind, what do you think of when you see this sign?
Sometimes the product, the service, the challenge is so large, complex, and difficult, that just keeping the train on the tracks and moving forward is a feat to be celebrated.