Which method is preferred for releasing stuck brakes on an M-7 equipment?

The preferred method for releasing stuck brakes on M-7 equipment is by using the service brake cutouts (SBCO). This approach allows for a safe and controlled release of the brakes while ensuring that other systems remain functional. The service brake cutouts disable the application of the service brakes, essentially isolating the affected brakes without impacting the overall braking system significantly.

Using service brake cutouts is advantageous because it minimizes disruption to the operational state of the train. It effectively addresses the issue of stuck brakes by allowing the operator to manage the braking system without resorting to more drastic measures, which could pose safety risks or lead to unnecessary wear on the equipment.

In contrast, the other options may not provide the same level of efficiency or safety. For instance, using emergency cutouts can lead to a complete loss of brake function, which is not ideal in most situations. Manual overrides also may not address the underlying issue effectively, and while brake cylinder cutouts are an option, they typically do not offer the same balance of control and safety that service brake cutouts provide in this specific scenario.