Which term refers to a method of establishing working limits by physically preventing entry onto a non-controlled track?

The term that refers to a method of establishing working limits by physically preventing entry onto a non-controlled track is "Inaccessible track." This term specifically denotes that the area is rendered off-limits to trains and crew members, thus ensuring safety during maintenance or other operations.

Inaccessible track is typically achieved through the use of physical barriers, such as gates, locks, or other forms of signaling that clearly indicate to personnel that the track cannot be accessed at that time. This designation is important for protecting workers who are completing their tasks in the vicinity of rail operations, as it effectively reduces the risk of accidents caused by unexpected train movements.

In contrast, working limits generally refer to the broader set of established boundaries within which train movements are regulated or restricted for work activities but do not specifically indicate physical barriers. Main track refers to tracks designated for the regular operation of trains, while controlled track indicates tracks where train movements are governed by signals or other controls. These terms do not apply specifically to the method of preventing entry onto a non-controlled track.