Question

After coasting for some distance, a train operator on a regular subway run moves the controller handle to multiple and finds that the train does not pick up speed. The train operator CANNOT find out whether the third rail is dead by ________.

1) Checking the voltage of the third rail
2) Observing if other trains are moving normally
3) Contacting the control center
4) Inspecting the third rail visually

Answer 1

Inspecting the third rail visually cannot determine if it is dead, as this requires checking voltage or other indicators.

Step-by-step explanation:

The train operator cannot find out whether the third rail is dead by inspecting the third rail visually. A visual inspection cannot provide information on the voltage or electrical current status of the third rail.

Instead, to determine if the third rail is dead, one would need to use specialized equipment to check the voltage of the third rail, observe if other trains are moving normally (suggesting the third rail is functioning), or contact the control center to report the issue and request information about the status of the third rail power.