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A train operator operating in a yard hears one long blast of the tower whistle. He should

User Zhaf
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Final answer:

When a train operator hears one long blast of the tower whistle, it indicates that the train is about to move forward.

Step-by-step explanation:

When a train operator operating in a yard hears one long blast of the tower whistle, it means that the train is about to move forward. This is a signal for the operator to be ready to start the train. The long blast is a standard signal used in railroad operations to communicate with train operators.

User Uelb
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