Translations:AY Honors/Whistles/Answer Key/7/en
From Pathfinder Wiki
Industrial whistles are used for signaling and timekeeping both on railroad and ships, and in factories. Most of these whistles were steam powered and not standardized. Individual locomotives could be identified by their whistles. At noontime in industrial areas up into the 1950s whistles of every pitch could be heard, as each factory had a boiler and a whistle, if not full steam power.
