Light Bell Horn Air Release Coupling Brake release/Squeal Dynamic Brake Air Hose/Uncoupling Lever Shut Down/Notch Down Cooling Fan/Notch Up Rail Clack Air Compressor Prime MoverType Air release Flange Noise Air Pump Loco Sound Flange Noise Bell Type Horn Type Loco Sound Bell Volume Horn Volume Prime Mover Volume Coupling Air Releease Flange Noise Air Hose Firing Air Release Linear Slow increase at slow speed Fast increase at slow speed Auto notch Manual notch SD60 SD70 AlCo 244 EMD 567B MRC