Hancock air whistle
The Hancock air whistle was a railroad whistle intended for use on North American diesel locomotives in place of the standard air horn. It was manufactured by the Hancock Valve Division of Manning, Maxwell and Moore.
The Hancock air whistle was a railroad whistle intended for use on North American diesel locomotives in place of the standard air horn. It was manufactured by the Hancock Valve Division of Manning, Maxwell and Moore.
The Hancock air whistle was a railroad whistle intended for use on North American diesel locomotives in place of the standard air horn. It was manufactured by the Hancock Valve Division of Manning, Maxwell and Moore.
Source: Wikipedia "Hancock air whistle" · CC BY-SA 4.0
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