What does train order signals communicate to crews?

Train order signals are a crucial component of railway communication, specifically designed to relay instructions that affect the operation of trains. They serve as a means for dispatchers or railway authorities to communicate essential information regarding the movements of trains, schedule changes, and any modifications to the running or handling of the trains on the track.

When train order signals are activated, they convey critical directives such as permission to proceed, restrictions on speed, or the need for a train to wait at a specific location. This ensures that train crews operate safely and efficiently, in line with the current operational needs of the railway. Additionally, these signals can provide information about where and when trains should stop, pass, or take particular actions, which is vital for maintaining the overall flow of rail traffic and ensuring safety.

While maintenance, passenger complaints, and service improvements are important aspects of railway operations, they are not the primary purpose of train order signals. Instead, these signals focus strictly on operational instructions and adjustments necessary for the scheduling and movement of trains, making the option regarding instructions about movements and schedule changes the correct response.