What governs the operation of a controlled block in railway networks?

The operation of a controlled block in railway networks is governed by the signals designated for that specific block. Signals play a crucial role in ensuring safe train movements by conveying important information regarding the status of the track ahead. They indicate whether a block is occupied or clear, thereby influencing the actions of the train crew regarding speed and stopping.

In a controlled block system, signals are essential in managing train traffic and preventing collisions. They communicate appropriate instructions to train operators, ensuring that trains only proceed when it is safe to do so. This system relies heavily on the proper functioning of the signals to maintain smooth and orderly train operations, making them the primary governing factor for block control.

While weather conditions, visibility, dispatcher commands, and scheduled arrivals can influence operational decisions, they do not directly govern the function of a controlled block as signals do. Signals remain the key indicators for the train crew, guiding them through each controlled block appropriately.