Ding Dong, Train Approaching

I ride trax almost every weekday in Salt Lake. Between my interpreting experience and my sound background, I can't help but listen to the sounds on the train. Here's my gripe for the day:

When the trax train approaches the station, it goes "ding-dong" and a woman's voice says, "train approaching." Then, when the train starts moving, it has a nice bell sound. Even the horn of the train is a traditional train horn. Notice that all of these warnings are to make you aware that something life-threatening is going on around you. Once you're on the train, and the doors are about to close, the doors make this crazy loud sound of a fire alarm that hurts your ears. Look out, the doors are closing! Oh no, the sensors that keep the doors open when something's in the way may fail and the doors may gently tap you on the shoulder! Why in the world is THAT the sound for the least dangerous part of the whole process.

WARNING: Sound nerdiness ahead

I went to AES in New York in October 2005 and heard about how they changed the sound that air traffic controllers heard in a danger situation. When they changed that sound to something more pleasant and less stressful, they actually did their jobs better and had less stress and illness. Can you think of a group of people you'd want less stress in than the Salt Lake workforce?