Whistle Sounds

––– • ––– Train Approaching X'ing
• • • Train Backing Up
• • • • Call for Signals
––– • • • Flagman Protect Train Rear
• • • ––– Flagman Protect Train Front
• ––– Brakes Sticking
––– Station Approach
• • Train Moving or Signal Received
• STOP
––– ––– ––– ––– Flagman Return to Train
––– ––– ––– Train has Departed