Once authority is received to operate track equipment with high-rail gear, what must be done before setting on a Main Track?

Once authority is received to operate track equipment with high-rail gear, the key requirement before setting on a Main Track is that the RWIC (Roadway Worker In Charge) must apply Static Speed Deviation (SSD) on the track. This safety procedure is essential because it helps ensure that the track is clear for the movement of the equipment and establishes a controlled environment for the operations being conducted. Applying SSD allows for additional safety measures by managing speed limits and ensuring that workers are aware of any potential hazards.

This requirement emphasizes the importance of adhering to established safety protocols when operating on tracks, particularly in scenarios involving heavy equipment. It ensures not just the safety of the personnel involved but also protects the integrity of the rail system operations.

In the context of the other options, while track inspection and signal clearance are important safety measures in railway operations, they are not the immediate action required after authority is granted for high-rail equipment operations. Checking the weather report, although prudent in some circumstances, does not directly impact the immediate safety protocols that need to be followed for setting on a Main Track. Thus, the necessary action revolves around the application of SSD by the RWIC.