What does a Yard track primarily facilitate?

A yard track primarily facilitates the process of making up trains, which involves assembling various railcars to form a complete train. This is an essential function in railway operations, as it allows for efficient organization and coordination of railcars based on different destinations or purposes. The yard track is designed to accommodate the movement and arrangement of cars, enabling conductors and yard crews to couple and uncouple cars, switch tracks, and manage train formations effectively.

The other choices list functions that are not the main purpose of yard tracks. While some passenger loading may occur at certain yard tracks, it is not their primary role. Similarly, high-speed travel is associated with main lines designed for speed and not the slower, more controlled environment of yard tracks. Freight unloading typically takes place in loading docks or specialized freight terminals, rather than on yard tracks where the focus is on organizing and assembling trains rather than unloading them.