- ...that there has been five stations named Shepherd's Bush, three called Wood Lane and two titled White City?
- ...that the Greenwich foot tunnel is classed as a public highway, and is therefore kept open by law 24 hours a day?
- ...that an estimated half a million mice live on the Underground system, and can often be seen running around the tracks?
- ...that at Whitechapel the London Overground line runs below the London Underground line?