Which method is preferred for releasing stuck brakes on an M-3 car?

The preferred method for releasing stuck brakes on an M-3 car is using the EP cutouts. This approach is favored because the EP (Emergency-Parking) brakes are designed specifically for scenarios where brake release is necessary, allowing for controlled operation of the braking system. The EP cutouts can effectively disengage the emergency brake mechanism, ensuring that the brakes can be released without impacting the overall functionality of the train.

In contrast, other methods may involve complexities or risks that could compromise safety or operational integrity. Using truck cutouts or service brake cutouts could potentially lead to broader system issues, as these methods might not directly address the stuck brakes while still maintaining a connection to the entire brake control system. Manual release, while it can sometimes work, might not be as reliable or efficient under all circumstances as the specifically designed EP cutouts.

Therefore, the practice of using EP cutouts is established as the most effective procedure, ensuring that stuck brakes can be handled safely and efficiently while minimizing risks to the train's operation.