| 21. | Eighteen of these locomotives were rebuilt with piston valves and superheated boilers in the 1930s.
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| 22. | Conventionally, piston valve locomotives had inside admission, whereas outside admission was used with slide valve locomotives.
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| 23. | *The inlet valve ( not the piston valve ) is a " sprung bash valve ".
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| 24. | The class were fitted with a steam chest and slide valves located beneath the piston valves.
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| 25. | They had outside Gooch valve gear and piston valves, a very early use of piston valves.
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| 26. | They had outside Gooch valve gear and piston valves, a very early use of piston valves.
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| 27. | These proved successful but insufficiently so to be chosen for production locomotives over the reliable piston valve.
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| 28. | Fourteen were equipped with superheated boilers, bore cylinders and inside admission piston valves, and were reclassified to.
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| 29. | It used piston valves and eccentric motion.
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| 30. | While the Class 10 had outside admission valves, the Class 10-2 superheated used inside admission piston valves.
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