Trains carried lumber, grain, steel and people who built this land.  The train whistle was essential because its sound warned others that the train was about to start up, stop or was approaching a crossing.  It was also a signal to the people  on the train what was going to happen next. 

Two Long Blasts of the whistle was a signal from the engineer to release the brakes.  This also warned people in the station to stand clear because the train was about to move. 

One Long Blast was the signal that the train was approaching a crossing or station and was a warning to otherers to be careful.

One Short Toot meant to apply the brakes and stop.

Three Short Toots meant the train was about to back up.

One Long and One Short Blast was a general warning of danger used for emergencies.

A Series of Short Toots meant to get off the tracks.

Steam Locomotives could no stop quickly, so it was up to others to stay out of the way.  The unique sound of the steam whistle was an important signal as the steam-powered locomotive helped shape our Nation from coast to coast.