A powerful whistle worked by a jet of steam (usually from a steam-boiler): used as a signal.

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1840.  H. S. Tanner, Canals & Rail Roads U. S., 261. Steam whistle, a device for warning persons when the engine is approaching.

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1856.  Emerson, Eng. Traits, xiv. The voice of their modern muse has a slight hint of the steam-whistle.

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1899.  T. M. Ellis, Three Cat’s-Eye Rings, 123. A bullet … shrieked past Clayside’s ear like a steam-whistle.

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  attrib.  1870.  Ruskin, Lett., in Athenæum (1905), 30 Sept., 428/3. Dickens was a pure modernist—a leader of the steam-whistle party par excellence.

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1887.  F. Hume, Myst. Hansom Cab, viii. Let us go outside, for I see your father has got that girl with the steam-whistle voice to sing.

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  Hence Steam-whistling vbl. sb.

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1866.  Ruskin, Crown of Wild Olive, iv. § 152. Steam-piston labour on the earth, and the harvest of it brought forth with steam-whistling.

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