(plural heads of steam)
From the need of the boiler of a steam locomotive to exceed a minimum amount of pressure (See head (“buildup of fluid pressure”), also pressure head.) before the locomotive could start moving.
"head-of-steam." YourDictionary, n.d. Web. 16 January 2019. <https://www.yourdictionary.com/head-of-steam>.
head-of-steam. (n.d.). Retrieved January 16th, 2019, from https://www.yourdictionary.com/head-of-steam
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