Clive Feather can't remember not being interested in railways and the London Underground in particular. As a child he often traveled on the Bakerloo and Metropolitan Lines to Watford, where his grandparents lived. By the age of 8, he had memorized the complete Underground map (though these days he's a bit rusty about some of the outer stations). He has been running the Clive's Underground Line Guides web site for more than 20 years (www.davros.org/rail/culg/). The History of the Bakerloo Line is his first book.