My railroad was not a major bridge route, so most of the traffic is to/from on-railroad industries.
However, I’m only modeling part of it, so some of those industries are off-layout, and the cars will come up from staging to the modelled interchange point. There is also SOME small amount of bridge that runs end-to-end using the ACR to connect two other railroads.
But certain types of cars like TOFC/intermodal, autoracks, stock cars, grain hoppers, will not use my line due to simple geography and none of those types of industries on my railway.
My railway’s industrial base consists of:
Steel Mill - off the modeled part of the railway, but the biggest customer. Traffic is well represented by steel loads from staging to the on-layout interchanges with CN and CP. Some interesting research on the steel industry also adds in the occasional load of various chemicals related to the steel making process (flatcars, gondolas, tanks)
Mine/Ore Processing Plant - biggest modeled industry on the layout. Processed iron ore is shipped south to the railway-served steel mill (off-layout/staging). Also limestone and coke is brought in to the ore plant via a harbour a few miles away on the same branch. (open hoppers)
Sawmill - one significant on-layout modeled sawmill produces lumber and woodchips. A few other off-layout lumber, veneer, and plywood mills provided additional lumber bridge traffic (boxcars, flatcars, woodchip gondolas)
Logging - saw logs and pulpwood are cut and loaded in several locations. Some to the on-layout sawmill, some to an off-layout paper mill (flatcars, gondolas)
Fuel Dealer(s) - several small fuel dealers receive tanks of gasoline/diesel fuel or propane (tank cars)
Copper mining/smelter - (off-layout bridge traffic) mining/smelting activity on a connecting road provides boxcars of refined metal products and tanks of sulphuric acid to bridge traffic (boxcars, tanks)
Paper mill(s) - a major mill is served by my railway,