What does one long and one short horn signal indicate?

One long and one short horn signal is commonly used in rail operations to convey specific messages on the track. In this context, the correct interpretation of this signal is that it is a request for police assistance.

In railroad signaling, each type of horn signal is standardized to communicate important information to train crews and those working on or around the tracks. When the horn emits one long sound followed by a short sound, it indicates that the train crew is requesting help or assistance, often in situations requiring immediate attention due to safety concerns.

Understanding these signals is crucial for safety and communication within the rail system, as they allow for quick and effective responses in emergencies or unusual circumstances.