What might indicate to a train operator that they are operating pneumatically rather than electrically?

A delay in the initial brake application could indicate to a train operator that they are operating pneumatically rather than electrically. In pneumatic systems, the braking process involves the use of compressed air, which takes a certain amount of time to alter pressure and engage the brakes. When a train operator initiates a brake application in a pneumatic system, there may be a noticeable lag before the brakes actually engage due to the time it takes for air to travel through the system and build up pressure.

In contrast, electrical braking systems can typically provide a more immediate response since they rely on electrical signals to activate the brake systems directly. This can reduce the time delay significantly compared to a pneumatic system, where such delays are common and expected.

Understanding the operation of different braking systems is crucial for train operators, as it influences how they manage braking distances, respond to commands, and ensure passenger safety. Recognizing the signs of pneumatic operation allows for better situational awareness and more effective handling of the train under various conditions.