Val, here are a few mor informations which might interest you.
Blast furnaces, oxygene lance ovens and electro-steel furnaces are exclusively used in steel mills. (To get steel you have to treat either cast-iron or scrap steel so that its carbon content is in the range of 0.7% to about 2%)
The products of these plants are either thin steel sheets which are coiled up (you know them from the RR coil cars) - or steel ingots (thick bars), which probably will be processed in a rolling mill. (Rolling mills are the source of - among other things - rails, I-beams etc.)
IF - and only IF! - sheet metal is needed (say for a cabin or motor hood) in your tractor factory, perhaps they could need a loaded coil car from time to time.
However, for CASTING parts like crankcases, gearbox casings etc. your LPBs

D) probably would use carbon-rich cast-iron. And this is sold in the form of ingots right from the blast furnace, where iron ore (+ coke) is reduced to metallic iron with a carbon content of more than 3%. Cast-iron ingots could be delivered to your plant on heavy-duty flatcars or in gondolas. (BTW: These ingots were also called 'pig iron' - remember the song 'Rock Island Line'?

)
Then your LPBs would melt these ingots in a probably oil (or electrically) fired oven and pour the molten iron into molds. So your plant would also need a steady flow of tank cars.
All this sums up to quite a lively freight car traffic around your plant. And I didn't even mention the cars to carry off the products, the slag (which is a side-product of the casting process) and other metal junk...
You see, your switching crews will be kept very busy. May your plant live long and prosper!
Ron