What is a clearance card (Form - A) used for?

A clearance card, also known as Form A, is specifically utilized to outline the conditions under which a train may be permitted to pass through a stop block signal. This card ensures that all safety protocols are adhered to and that the movement through the signal is authorized under defined circumstances, which may include verifying that tracks ahead are clear and safe for operations.

Using a clearance card plays a critical role in maintaining safety and operational efficiency within the railway system. It provides a necessary authorization that keeps the rail operations organized and reduces the risk of accidents that could occur from unauthorized movements through clearly defined stopping points.

While the other options may relate to operational processes, they do not accurately reflect the purpose of a clearance card. Train delays, maintenance notifications, and speed limit confirmations pertain to different aspects of train operations and safety protocols, and are not functions served by a clearance card.