File:Pulling heater cables through a trough line in Harold Interlocking. (FHL02, 5-15-2018) (27327592437).jpg
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![File:Pulling heater cables through a trough line in Harold Interlocking. (FHL02, 5-15-2018) (27327592437).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a1/Pulling_heater_cables_through_a_trough_line_in_Harold_Interlocking._%28FHL02%2C_5-15-2018%29_%2827327592437%29.jpg/800px-Pulling_heater_cables_through_a_trough_line_in_Harold_Interlocking._%28FHL02%2C_5-15-2018%29_%2827327592437%29.jpg?20181120175712)
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