![]() The steam-flow characteristics would have been poor (because of the length of the ports) but this would not have mattered unduly in an engine that ran only at slow speed. Instead, the large outside piston valves (as well as supplying the outside cylinders) supplied the inside cylinders through cross-over steam ports. There were four cylinders but only two sets of piston valves because there was insufficient space under the smokebox to fit piston valves for the inside cylinders. The engine, known as "Big Bertha" or "Big Emma" by railwaymen and railway enthusiasts, was built at the Midland Railway's Derby Works in 1919.īig Bertha's cylinder arrangement was unusual. ![]() She's quite timid upon meeting someone for the first time, but becomes more outgoing the more comfortable she becomes.īertha is based on the Midland Railway's 0-10-0 tender engine built specifically for banking duties on the Lickey Incline in Worcestershire. ![]() Biography Stories From Sodor:Future Season 22 Personalityīertha is the epitome of the phrase "gentle giant".
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