I was watching a video on YouTube which described in detail how an engineer would operate an Amtrak P42 locomotive. One of the things that was mentioned is that there is a horn button and a bell button on the console, and there is also a horn foot pedal.
I assume this would also apply to freight trains, so my question is: When is it appropriate to use the foot pedal vs. the console button? Are there specific rules that Amtrak has regarding this, or is it left up to the individual engineer? Are the protocols different for the freight railroad companies?