The CSX line is indeed dependent on coal traffic. While there is less than there was a few years ago, there is still plenty of coal action on the line. There are also 4-6 daily freights, a local, and whatever 'special' trains (unit trains other than coal, MOW) might come through. You can see 3 trains in an hour or no trains for 3 hours. It just depends on the day.
The NS S-Line is less busy and you can find yourself sitting for long periods of time with out a train. The loops see 4 daily freights (134,135,162,165), one turn local (P87), two more locals for pusher and extra service (P32, P34), you might get a coal train or two (744,745,749,750), and then again any special train.
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