| 21. | A greater quantity of steam can be generated from a given quantity of water by superheating it.
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| 22. | It declined in popularity due to maintenance issues and because superheating provided similar efficiencies at lower cost.
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| 23. | In 1944 another engine was converted to superheating, but the second steam dome was not used.
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| 24. | Steel superheating, as short journeys allow little time for the superheater elements to reach working temperature.
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| 25. | Hawksworth decided that the declining quality of coal reaching Great Western depots necessitated a higher degree of superheating.
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| 26. | Marsh therefore built four more superheated locomotives and six without superheating, between February 1909 and March 1910.
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| 27. | Superheating also required alteration of the valve gear and piston valves were therefore used instead of slide valves.
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| 28. | The heating surface of the boiler was, of which was superheating surface, while the grate area was.
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| 29. | Despite the success of the superheating the Dd boiler, it was still somewhat limited in steam raising capabilities.
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| 30. | A liquid at or above its boiling point will normally boil, though superheating can prevent this in certain circumstances.
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