What authority does an extra train need to operate on the Main Track in Single Track 251 territory?

In Single Track 251 territory, an extra train requires Form L authority or permission from the Block Operator in order to operate on the Main Track. This requirement is put in place to ensure that all movements are properly controlled and coordinated to prevent conflicts with regular train operations. Form L serves as a formal authorization that clearly outlines the conditions under which the extra train may operate, including its movements and any relevant restrictions.

Permission from the Block Operator is crucial for maintaining safety and effective traffic management within the territory. The Block Operator has the knowledge and responsibility to manage train movements and ensure that the extra train can operate safely without interfering with other trains that may be on the same tracks.

Other options suggest that less formal procedures could be used, like verbal permission or simply relying on signal indications, which wouldn’t provide the level of safety and coordination required in this operating environment. Thus, the necessity of having proper authority like Form L or Block Operator permission is vital in maintaining smooth and safe operations on the Main Track.