How can you determine that the Engine RPM Overspeed device has tripped, and how do you reset it?

How can you determine that the Engine RPM Overspeed device has tripped, and how do you reset it?

• A. An alarm will sound and the overspeed lever will be pointed toward the right side; to reset, pull the overspeed lever toward you from the left side of the locomotive.
• B. Engine RPM gauge will drop to idle and no reset is required.
• C. Only a warning light appears and you reset by pressing reset button.
• D. The engine will not indicate any change; you reset by turning the power off.

Answer: (A)

When the Engine RPM Overspeed device trips, the system gives an audible alarm and moves the overspeed lever to the tripped position toward the right. That combination—alarm plus the lever indicating trip—provides both a warning and a clear mechanical signal that protection has engaged, so you know normal operation has been interrupted and needs attention. Resetting is done by pulling the overspeed lever toward you from the left side of the locomotive, which re-engages the control after you’ve addressed the cause of the overspeed. Other scenarios described—like a simple gauge drop with no reset, only a warning light with a reset button, or no indication at all and turning power off—don’t match how this protective device signals and allows resetting, since they don’t align with the audible alert plus mechanical lever reset that the system uses.

When the Engine RPM Overspeed device trips, the system gives an audible alarm and moves the overspeed lever to the tripped position toward the right. That combination—alarm plus the lever indicating trip—provides both a warning and a clear mechanical signal that protection has engaged, so you know normal operation has been interrupted and needs attention. Resetting is done by pulling the overspeed lever toward you from the left side of the locomotive, which re-engages the control after you’ve addressed the cause of the overspeed. Other scenarios described—like a simple gauge drop with no reset, only a warning light with a reset button, or no indication at all and turning power off—don’t match how this protective device signals and allows resetting, since they don’t align with the audible alert plus mechanical lever reset that the system uses.