I know little of car pools and am maybe oversimplifying things. My definition of a pool would be: Railroad X buys freight cars to carry an industries product. That industry loads and sends the cars indecrimitly with the cars returning for another load when empty.
My understanding of a freightcar pool is the railroad that stands to get the greatest percentage of the line haul business has to contribute a corresponding number of cars to the pool. Other roads which get a smaller piece of the revenue pie contribute fewer cars.
