The Alphabet Challenge is simple - starting at a station that begins with 'A' travel to one that starts with 'B' and so on until you get to 'W' (there's no X, Y or Z). You have to do them in order for them to count, so although you may pass through a station beginning with 'C' on your way to 'B', you can't count it as 'C' until you've been to 'B' (we told you it was simple)!
Two people have posted times for this challenge. David Scard and his friend Tara did it on the 21st of August, 2004 and managed a time of 5 hours, 56 minutes exactly. They started at Aldgate and finished at Westminster.
The other challengers were Steven Karahan and Samuel Robinson who went out in October 2004 and set a time of 5 hours, 20 minutes and 25 seconds, the fastest we know of. Their start and finish points were the same as David's.
If you've done this challenge and have a time to share then contact us and let us know!
1. Steven Karahan and Samuel Robinson - 5 hours, 20 minutes and 25 seconds
2. David Scard and Tara Exell - 5 hours, 56 minutes