What is the exception regarding excessive dimension equipment in track bulletins?

Excessive dimension equipment has specific guidelines for identification in track bulletins, primarily to ensure safety and proper tracking on the railroads. When excessive dimension equipment is involved, it is crucial for operators and crew members to accurately pinpoint these vehicles to ensure safe navigation, particularly in areas where clearances may be a concern.

Identifying excessive dimension equipment by train symbol rather than solely by engine numbers provides a clear reference for crews that is easier to associate with specific movements and logistical planning on the rail network. Train symbols are designed to encapsulate essential details about the train's purpose and route, making them a practical choice for identifying unique equipment that requires special handling or attention.

This approach ensures that personnel who refer to track bulletins can quickly recognize the train and its possible implications on operations, which is not as straightforward when relying only on engine numbers. In doing so, it enhances communication and mitigates the risks associated with excessive dimensions on the tracks.

The other options do not align with the established practices for identifying excessive dimension equipment in track bulletins as effectively as using train symbols.