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"Tugboat Annie", a 4 cylinder, 8 beat Pacific that was built by L.B.S.C. and has some features that exist in the British Railways engine "Britannia", except that Britannia has only two cylinders. The type of valve gear that operates the inside cylinder valves was especially designed and tried out on this engine first before it went into full sized engines, and was by the famed designer Holcroft. So here is one rare instance where a small gauge engine was the "prototype" on some of its features. From "The Live Steamer", July-August 1951