An AD60 Garratt Locomotive No 6063 is the headline lot of the Dennis Brown collection of model trains, which will auction at Dreweatts & Bloomsbury on September 10.
The steam-powered lot, valued at £15,000-18,000 ($20,238-30,357), is 12 feet long and weighs around 450lbs.
The world record for a model train at auction was set at Dreweatts in 2012, when the LMS Pacific type Duchess of Buccleuch achieved £140,000 ($236,117).
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