The following assumptions hold for all three models. First, the following unit conversions are assumed:
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1 bushel of grain = 55 pounds = 0.0275 tons.
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1 jumbo hopper = 286 k pounds (220 k pounds of grain + 66 k tare) = 110 tons of grain.
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1 shuttle train = 110 railcars = 12,100 tons of grain.
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1 conventional train = 24 railcars = 2640 short tons of grain.