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Stirling engines are fun physics toys that show how heat can be turned into mechanical work. There are plenty of cheap ones on the market for students. The GO-AHEAD Stirling Engine Train takes it to the next level. It has an adjustable safety valve, water level meter, working whistle, stainless steel drive, and runs on Butane gas.
More gadgets like this: here
This 1:20.3 scale train is available on AliExpress. The bad news? Something like this doesn’t come cheap.
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