In truth, it can be tough to find the old Chicago, the lunch-bucket, working-class town that jumped to the sound of factory whistles.

These were popular as factory whistles.

The society expanded its mission to lobby for rubber tires on milk wagons and oppose factory whistles, firecrackers, and boys clacking sticks along iron fences.

In Texas, these warnings were delivered to residents via factory whistles.

The factory whistles blew; the day shift was released and within minutes the yard and the corridors would be crowded.

Like factory whistles and buttered steaks, the Hoffa name evoked a muscular era, but one that seemed to have lost its relevance.

The factory whistles, in a festive gesture, had sounded an hour earlier than usual.

Church bells pealed, sirens wailed and factory whistles hooted as people streamed into streets, squares and boulevards.

Earlier than that, I suppose, there were factory whistles which I was never awake to hear.

In many non-seafaring communities, loud factory whistles served as public time signals before radio made them obsolete.