Where is the motor reset button located in PA4 cars?

The motor reset button in PA4 cars is strategically located in front of the engineer, positioned between the brake handle and the master controller. This placement is intentional as it allows for quick and easy access for the engineer while operating the train, ensuring that they can efficiently respond to any situation that may require the resetting of the motor. Having the button in this location minimizes the time and effort needed to reset the motor, which is crucial during operation when every second counts.

The other locations suggested do not provide the same level of accessibility or practicality. For instance, having the reset button at the rear of the engineer's seat or on the roof of the cabin would require the engineer to leave their operational position, which could be unsafe and inefficient. Likewise, placing the button under the control panel would make it difficult to reach in a timely manner in case of an emergency. Therefore, positioning the motor reset button in front of the engineer between the brake handle and master controller is a design choice that enhances both safety and operational efficiency.