What should the position of the MU2A or double ported cutout cock be on trailing locomotives?

The proper position of the MU2A or double ported cutout cock on trailing locomotives should be "out." This configuration is crucial as it allows for proper air flow and functionality of the braking system. When the cutout cock is in the "out" position, it enables the brake system of the leading locomotive to control the trailing unit effectively. This ensures that both locomotives work in tandem during operations, promoting safety and efficient train handling.

When the cutout cock is engaged or put "in," the trailing locomotive's brake system is cut out from the trainline, which can lead to less effective braking performance or control issues, especially in multi-unit trains. This can pose risks during stopping or emergency situations, emphasizing the importance of ensuring the cutout is in the correct position for optimal performance.