What is the train operator's whistle signal to call a car inspector?

The train operator's whistle signal designated for calling a car inspector is short-short-short. This specific sequence is distinct and recognized within rail operations, allowing for clear communication with car inspectors regardless of surrounding noise or confusion. The brevity of the three short blasts makes it effective and easily perceivable, ensuring that the inspector can promptly identify the request for inspection.

In practice, the use of this signal helps maintain safety and efficiency in train operations, as it allows for immediate attention to potential issues with the train cars. Signals like these are standardized across many rail networks to ensure consistent communication, thereby avoiding misunderstandings that could arise with other patterns that might have different meanings.