$(20\text{'})$ Suppose three through trains travel the corridor from A to D each day the line is open $(350$ days of the year$).$ On average, these trains weigh $5,000$ tons each $-$ e$.$g$.,$ the average GTCC is $5,000$ tons. An additional four trains travel the corridor from D to A each day the line is open. On average, the contents of these trains weigh $5,500$ tons. The trains are a mixture of loaded and empty cars in both directions. On average, there are $75$ cars in an eastbound train and $80$ cars in a westbound train. Each train is powered by two locomotive units weighing $200$ tons each.

For terminal B$,$ what is the carload handled in a year of operation?

For the entire corridor, what are the train miles? car miles? Locomotive miles?

Calculate the gross ton$-$miles of cars and contents, total gross ton$-$miles.$|$

Calculate the gross ton$-$miles per mile.