John,
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At first look - this is a relatively simple solution in Ops Pro.
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However, a couple of questions to clarify how you want to operate....
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1. Do you have a track from which the local brings in the cars from the rest of the world, and takes them back out, or are the cars in tracks 4,5 and 6 deemed at the start to be the deliveries, then, on the next round, deemed to be the next set of deliveries (that is, the cars actually do not move out of the yard, it is just their status that is changing)?
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2. Can the empty cars delivering the corn be used to load the DDG?
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3. Are the tank cars only assigned to track 7, or could the local deliver more tank cars and need to put them in tracks 4, 5 or 6 for the switcher to switch when those cars on track 7 are loaded?
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Regards,
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Eric
