Bertie is again a small, simple locomotive using much of the technology used with Millie. It has the same sized cylinders (with slide valves) as the mainstream Roundhouse engines, and they are controlled by an effective slip eccentric valve gear. Like the mainstream locomotives, the boiler is internally fired by gas and is generously sized, its bulk being well disguised in the saddle tank. Like Millie there is an optional top up system and water gauge glass. The cab houses the gas regulator, steam regulator and displacement lubricator. Internally gas fired, slip eccentric reversing, built for either 32 or 45mm gauges. Full colour choice available.
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