| 21. | However, simply increasing the boiler pressure would have made an engine more powerful without increasing its efficiency.
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| 22. | Their boiler pressure setting was reduced from.
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| 23. | All were rebuilt with new boilers and extended smokeboxes from 1918 and some had increased boiler pressure.
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| 24. | Boiler pressure was 100 pounds of steam and the engine turned 92 revolutions per minute at top speed.
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| 25. | The boiler pressure was rated at.
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| 26. | Several locomotives were later given boilers with the higher boiler pressure and were then classified as G 4.1.
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| 27. | They were described as " free steaming ", meaning they could maintain boiler pressure regardless of throttle setting.
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| 28. | Over time the boiler pressure was upped, and 36 inch diameter cylinders replaced the original 42 inch cylinders.
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| 29. | With such a setting, when the exhaust opens, the steam in the cylinder is near full boiler pressure.
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| 30. | For steam locomotives, additional parameters such as boiler pressure and fire state can be set, monitored, and controlled.
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