As the two GP40-2s approached the CO-72 highway crossing on the Rocky Flats Industrial Lead, they tripped a circuit causing the stoplight on CO-72 to turn red, stopping traffic. Once the stoplight was red, the light for the train changed from two reds, to the two greens you see on the right side of the frame. Once the geeps clear the circuit, their lights will change back to double red, and the stoplight for traffic will turn green.
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