Railroads are only inexpensive because they demand those minimums to reduce or eliminate their touch labor costs. If they removed those minimums, the price wou

Railroads are only inexpensive because they demand those minimums to reduce or eliminate their touch labor costs. If they removed those minimums, the price would go up substantially - your model doesn't include that cost on the train side, it would incur it on you as a shipping aggregator, making your costs uncompetitive. Just a guess, I haven't done an analysis.