![Tim Dunn on X: "Now I've ended up reading old notes and books about London Underground tube trains for the Northern Line that never were. Thanks, insomnia. https://t.co/ku8HjBXzzz" / X Tim Dunn on X: "Now I've ended up reading old notes and books about London Underground tube trains for the Northern Line that never were. Thanks, insomnia. https://t.co/ku8HjBXzzz" / X](https://pbs.twimg.com/media/DZGcgv7W0AIa3lV.jpg:large)
Tim Dunn on X: "Now I've ended up reading old notes and books about London Underground tube trains for the Northern Line that never were. Thanks, insomnia. https://t.co/ku8HjBXzzz" / X
![London Underground: The fastest stretch of Tube line where trains can reach massive 62mph as they speed along - MyLondon London Underground: The fastest stretch of Tube line where trains can reach massive 62mph as they speed along - MyLondon](https://i2-prod.mylondon.news/incoming/article25657562.ece/ALTERNATES/s615/4_Chalfont-and-Latimer.jpg)
London Underground: The fastest stretch of Tube line where trains can reach massive 62mph as they speed along - MyLondon
![Full list of London Underground line speeds from slowest to fastest and the difference is huge - MyLondon Full list of London Underground line speeds from slowest to fastest and the difference is huge - MyLondon](https://i2-prod.mylondon.news/incoming/article27557464.ece/ALTERNATES/s615/2_GettyImages-112213054.jpg)
Full list of London Underground line speeds from slowest to fastest and the difference is huge - MyLondon
![London Underground: The fastest stretch of Tube line where trains can reach massive 62mph as they speed along - MyLondon London Underground: The fastest stretch of Tube line where trains can reach massive 62mph as they speed along - MyLondon](https://i2-prod.mylondon.news/incoming/article24422421.ece/ALTERNATES/s615b/0_tube-map-Met-line.png)