What are "yard limits"?

"Yard limits" refer to a defined area within which specific rules apply to train movements and switching operations. In this context, these areas are crucial for ensuring safe and effective management of train traffic, especially in train yards and similar settings. Within yard limits, train crews must adhere to particular operating procedures, including speed restrictions and signaling regulations tailored to the complexities of yard operations. This helps prevent accidents and ensures the smooth handling of railcars and locomotives during activities such as coupling and uncoupling, or when shunting trains.

The other options focus on either maintenance work, speed restrictions, or crew changes, which are not the primary purpose of yard limits. While safety measures like speed limits may be enforced within yard limits, the essential characteristic of yard limits is the establishment of specific operational rules for train movements and switching, making the correct choice directly aligned with the functional definition of yard limits.