| 31. | The class comprised six rebuilds, with superheater, of L & YR Class 3 locomotives.
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| 32. | A larger three-row superheater and header regulator were fitted into Swindon No . 1 boiler.
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| 33. | In an HRSG, water passes through an economizer, then a boiler and then a superheater.
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| 34. | Technological problems dogged the voyage, including the superheater of one of her boilers being burnt out.
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| 35. | Different railways had different ideas about the merits of drawing air through the superheater elements when coasting.
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| 36. | The remainder were converted by Richard Maunsell between 1925 and 1927 using his own design of superheater.
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| 37. | They also had slightly smaller firebox and superheater heating areas than the engines of the first batch.
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| 38. | Steel superheating, as short journeys allow little time for the superheater elements to reach working temperature.
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| 39. | In 1914, an experimental superheater was fitted to Dd 882 and was found to be very successful.
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| 40. | This causes air to be drawn through the superheater and heated so that it keeps the cylinders warm.
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