In what situation would block signals be particularly important?

Block signals are crucial during scenarios involving the approach to terminals because they help manage train movements by ensuring that trains do not enter a section of track that may be occupied or unsafe. Terminals typically have higher train traffic and more complex operations, including arrivals, departures, and possible delays. In these high-density areas, block signals provide the necessary communication to prevent collisions and control the flow of trains entering and leaving the terminal. They indicate when it is safe for a train to advance, ensuring a clear path and maintaining safety protocols amidst the increased operational complexities.

In contrast, while maintenance checks, night operations, and high-speed train movements may also require signal management, the specific context of terminals makes block signals particularly vital due to the volume and variety of train movements involved. Effective use of block signals in this context prioritizes the safety and efficiency of operations within busy rail nodes.