train whistle
train whistle is a steam whistle.
Also recorded as air whistle; steam trumpet; steam locomotive whistle.
Overview
Audible signaling device on a steam locomotive.
In detail
Its recorded use is signalling whistle.
It forms part of steam locomotive.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“Train whistle”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q18669788: train whistle
Consult the source