File:Testing traffic and signal in Harold Interlocking. (FHA02, 5-10-2018) (41298571635).jpg
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![File:Testing traffic and signal in Harold Interlocking. (FHA02, 5-10-2018) (41298571635).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/9/91/Testing_traffic_and_signal_in_Harold_Interlocking._%28FHA02%2C_5-10-2018%29_%2841298571635%29.jpg/800px-Testing_traffic_and_signal_in_Harold_Interlocking._%28FHA02%2C_5-10-2018%29_%2841298571635%29.jpg?20181120175710)
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