I had a set of five four axle units one trip and the rear unit had a control stand much like is shown below. Notice the horn lever/button above the big red button.
These units were very noisey, and, that is putting it lightly! The conductor rode the head end with me, while the brakeman rode the rear unit.
It is mostly a hard pull for the first twelve miles out of town. At about the forth mile my sub-conscience faintly heard something odd. It was very cold outside, the windows were closed and as I said these units were very noisey. I had other things to concentrate on, so, at the time I didn't pay a lot of attention to the noise.
At about ten miles out, we went through a rock cut and I got a better handle on what the noise was. A horn was blowing back in the consist. I asked the conductor to go back and see what was going on. I watched him go back, unit to unit trying to find which one had the horn stuck open. As he got back to the rear unit where the brakeman was riding, the horn quit blowing.
When the conductor got back to the head end, he said that the brakeman had laid his arm up on the control stand right on top of the horn button and the unit was so loud that he didn't even realize that he had been blowing the horn for the past ten miles!
A half hour latter, the dispatcher called us up and asked if we had gotten our horn problem fixed. Apparently the entire countryside had been calling in to complain about the horn blowing.