Which signal instructs a train to stop and wait for further instructions?

The Working Limits Stop Sign is a crucial signal used in railway operations to indicate that a train must stop and wait for further instructions. This signal is typically employed in situations where work is being conducted on or near the tracks, and it ensures the safety of both the workers and the train crew. When a train approaches this sign, the crew recognizes that there are restrictions in place and that they must halt their movement until they receive guidance or clearance from the appropriate personnel.

Understanding the significance of this sign is essential for maintaining safety protocols and ensuring effective communication on the rail network. Elements like work zones can change frequently, and the Working Limits Stop Sign serves as a critical reminder that caution must be exercised.

In contrast, other choices provide different messages or purposes: for instance, the End of Block Sign indicates that the block section for a train has ended, and it is generally indicative of the need for vigilance rather than an outright stop. The Terminal Proceed is a signal permitting trains to enter a terminal but indicates that they can continue moving, while the Approach Sign warns that the train is approaching a signal or condition that may require stopping but does not explicitly instruct a halt and wait for further instructions as the Working Limits Stop Sign does.