Mike,
Did you get that big LONG email I sent ya early this morning? God how I wish I was still home in bed! LOL!
Yep, there are always two routes to industries, unless of course that industry happens to be a natural resource...then there are only outputs. Case in point: a mine-its source comes from the Earth, but its customers are power plants, refineries, etc.
Midwest Building Supply-This facility has the most traffic, since it has both inputs and outputs. It being a building supply, there are numerous sources for its inputs (not just lumber or plywood) and the output is to the public. The demand for building supply products is so great that the company MUST have daily deliveries to it 3 times a day by rail, and two times a day by truck.
The Wilson Sisters Trucking Company is serviced by rail as well, but this frequency is once a week. They receive their new tractors and trailers by rail, and they also receive their parts by rail and truck.
Midwest Power Authority receives its coal once a day via a unit train that visits Galaxon mining once a day as well. But, the mine has more outgoing traffic that usually ends up going to staging, since only a few roads have contracts with Galaxon for power plant delivery.
Finally, there is Midwest Food Cooperative. This facility is both an input area as well as an output area. Staging trains bring produce and other food in from across the nation, and local freight picks it up and delivers it to the team tracks, where it is unloaded to trucks directly from reefers and boxcars and then delivered to the stores.
Many types of industries and many ways of input and output.
Of course these are mere examples, and are not the end-all of my industries.