How many tracks in Harrison yard are equipped with derailers?

The correct choice indicates that the tracks in Harrison yard equipped with derailers are numbered from 5 through 16. Derailers are critical safety devices used to prevent runaway trains from leaving the yard or track. Their installation is typically standardized in certain areas of a rail yard for safety management.

The specific numbering of tracks being equipped with derailers, like 5 through 16, suggests operational practices that align with train safety protocols in that yard. It's important to recognize that tracks are often numbered based on their functions and safety requirements, which means understanding this layout can be essential for someone working in the yard.

In this context, the importance of knowing which specific tracks are equipped with derailers cannot be overstated, as it helps ensure that engineers and yard personnel are prepared for safe operations and maintenance.