How are temporary manual block signals placed in service?

Temporary manual block signals are placed in service through train orders or general notices. This procedure ensures that all relevant personnel are officially notified and that there is a documented approach for implementing the signal changes. The use of train orders or general notices provides a formal means of communication, which is critical for maintaining safety and coordination on the railway.

By following this process, the railway can maintain consistency and adherence to established protocols when placing signals into operation. It also enables operators, conductors, and other staff involved in train operations to be aware of any changes that might affect train movements, thereby reducing the risk of accidents or miscommunication.

In contrast, verbal communication, while useful for immediate situations, lacks the formality and documentation needed for safety-critical operations such as signal placement. Automated systems are not involved in the case of manual block signals, as these require human oversight. Dispatcher commands can initiate actions, but the formal documentation through train orders or general notices is the mechanism that formally places the signals in service.