What does it indicate if the CTA Rail System motors are not running?

Indicating that the 600VDC system has been shut down makes sense in the context of the CTA Rail System, as this system requires a continuous supply of voltage for the motors to operate. If the motors are not running, it suggests that they do not have the electrical energy necessary to power them, which directly points to the 600VDC supply being off.

For the system to function properly, the motors need to be connected to an energized power source; thus, if they are inactive, it can be inferred that there is a lack of power supply, ensuring that the 600VDC system is indeed shut down.

In other situations, like the third rail being energized or the system being in standby mode, the motors would still be able to run or be ready for operation. Understanding how these different operational states of the rail system relate to power availability is essential for effective troubleshooting and response in the rail transit environment.