Which term describes a track connected to the main track for meeting or passing trains?

The term that describes a track connected to the main track for meeting or passing trains is "siding." A siding is a secondary track that runs parallel to the main track and allows trains to pull aside, facilitating the passage of other trains. This is particularly important in maintaining the flow of train traffic and accommodating schedules without causing delays.

In railway operations, a siding is essential for practical reasons. It provides a designated space where one train can wait while another passes, reducing the potential for congestion on the main line. This function helps in optimizing the overall efficiency of rail operations.

The other terms mentioned have different meanings in the context of railway infrastructure. A branch line refers to a secondary route that diverges from the main line and serves specific destinations. A platform is a structure at a station where passengers board or alight from trains. A switch track, often called a turnout, is a mechanism that allows trains to change tracks, directing them from one track to another but not serving the specific purpose of passing trains.