Which whistle pattern is used to move the train backward?

• A. 1 blast
• B. 2 blasts
• C. 3 blasts
• D. 4 blasts

Answer: (D)

Four short blasts are used to signal the locomotive will move the train backward. This pattern is chosen because it’s clear and distinct in a mining environment where noise and limited visibility can make signals hard to read. A backward move needs to be unmistakable to anyone on or near the track, so four quick blasts convey that specific action without being confused with signals for starting, stopping, or other warnings. Other whistle patterns exist for those different actions, but none of them should be interpreted as backing up, which is why four short blasts is the proper cue for moving in reverse.