Which signal is not mentioned as needing specific permissions to pass?

Prepare for the CPKC Train Dispatcher Trainee Test with interactive flashcards and multiple-choice questions. Each query is complemented by hints and detailed explanations. Equip yourself for the test now!

The green signal is considered a clear indication that a train is permitted to proceed without needing additional permissions or specific instructions. It signifies that the track ahead is clear, allowing trains to move at the maximum allowed speed.

In contrast, the yellow flag, red flag, and yellow-red flag each represent conditions or restrictions that require a train to take specific actions, such as slowing down or stopping, and thus necessitate permission or further communication from the dispatcher to proceed safely. Therefore, the green signal stands out as the exception among the options listed, as it explicitly allows movement without the need for further permissions.

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