What is the function of a Siding track?

Answer: B — For meeting or passing trains

A siding track primarily functions as a supplemental track that allows for the meeting or passing of trains. This is particularly important in situations where two trains are operating on the same line that only has a single track available. By using the siding, one train can pull off the main line to let another train pass, thereby maintaining efficient train operations and minimizing delays. This use of siding tracks enhances overall traffic flow on the railroad network and is essential for coordinating the schedules of both freight and passenger services. In settings where there is limited track capacity, sidings play a crucial role in ensuring that trains can continue to operate safely and efficiently. The other choices do not accurately capture the primary purpose of siding tracks. While freight trains may utilize siding tracks, they are not exclusive to them; thus, siding tracks serve a broader role. They are not intended for emergency stoppages nor primarily designed as main routes for passenger services.