What are yard limits specified by?

Yard limits are specified by timetable special instructions. This designation is crucial because it outlines the specific areas within a yard where certain operational protocols apply, particularly regarding train movements. Timetable special instructions provide the necessary guidance for train crews and operating personnel, detailing the limits of yard operations and ensuring that safety protocols are adhered to within those defined boundaries. Proper adherence to these instructions contributes to the efficient and safe handling of train movements in yard areas. The incorporation of this information into the timetable ensures that all crew members have consistent access to critical operational information, fostering uniform understanding and compliance across the railway system.