The Discworld's first successful functioning steam locomotive, devised by Dick Simnel and his apprentices. Loved, much improved upon and the first recipient of all improvements and upgrades, she appears to develop a personality of her own throughout the course of Raising Steam.
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One of the very first successful locomotive designs in the middle 1840's was called the Iron Duke after the Duke of Wellington. But this one is clearly female, in a Gladys the Golem sort of way...