How may rules be issued, canceled or modified?

The correct option emphasizes that rules can be issued, canceled, or modified through Track Bulletins, General Orders, or Special Instructions. These documents serve as formal and established methods to communicate changes or updates related to operating procedures and safety protocols within the railroad environment.

Track Bulletins provide timely information regarding track conditions or hazards that can affect train operations. General Orders can introduce new policies or modifications to existing rules systematically, while Special Instructions cater to unique situations requiring specific guidance. This structured approach ensures that all personnel receive consistent and clear information regarding rules that impact their safety and operational efficiency.

In contrast, other methods such as General Notices or verbal instructions from a supervisor might lack the formality and standardization necessary for effectively communicating rule changes. While they may provide useful information or temporary directions, they do not encapsulate the comprehensive process needed for official rule modifications. Therefore, relying on established documents ensures adherence to safety and operational standards in the workplace.