Narrow gauge industrial and agricultural railways reached their peak in the early years of the 20th century and gradually declined thereafter, killed off by industrial closures, changing working practises and road competition. However one railway remained at work on a watercress farm in deepest, darkest Dorset. Largely forgotten by corporate executives, the ancient locomotive ‘Watercress Queen’ plodded around the watercress beds doing what it had always done since it was built in 1948. Today, in 2023, it’s still at work, although its future hangs by a thread. Railway author David Henshaw tells the story of the locomotive, the people who worked the beds and the railway that refused to die.