A group of laborers working on a large property watch as a train in the hills passes them every evening and sounds two loud notes from the train whistle. They begin to speculate about who might be sounding the code and one man named Gordon suggests that it is a call from an engineer to his lover. The rest of the men think he’s being overly romantic, but he eventually goes into the town, asks around, and finds out that he is right. Gordon tells the men that the engineer sounds the whistle to let a woman that he is in love with know he is safe as he passes by. The men begin to work more efficiently and quarrel less on the job site. However, one day they don’t hear the whistle and for a few days it is silent. They begin to feel gloomy and Gordon goes back into town to figure out what happened. He returns with news that they got married and are on their honeymoon. When the whistle returns it is a little further away and Gordon says it's because the engineer moved his wife into a house a little further away. They continue to work, but a little later the whistle stops again. Gordon goes to town again and when he returns they all hear the notes of the train sound somber in the distance. Gordon informs them that the engineer’s wife has died and now he sounds his whistle at the cemetery to let his wife know he’s okay.