Who must be notified if an emergency release has been operated or a seal broken?

The correct choice is to notify the train dispatcher or control operator if an emergency release has been operated or a seal has been broken. This is because the train dispatcher or control operator is responsible for overall train movement and safety on the network. They need to be informed immediately so they can assess the situation, communicate with the crew, and make necessary adjustments to train movements or operations to ensure safety.

The train dispatcher plays a critical role in managing the network, particularly during emergencies. Timely notification allows them to effectively coordinate the response, involve appropriate resources, and mitigate any potential safety issues that may arise from the emergency release or seal break. Additionally, the dispatcher is usually the point of contact for various operational matters, which makes their involvement essential in such situations.

While notifying other crew members and local law enforcement may also be necessary based on the situation, the priority is to inform the train dispatcher or control operator first to manage the overall operational response.