In my opinion, to create new industry chains that lack infrastructure that automatically converts/uses/produces certain products I would use the building Multiple Industry New, which can be set up to what ever resources you would prefer. This should be a built-in asset with most versions of Trainz, and should include TS12 (IDK about TS12, but this structure is in Trainz Mac and T:ANE).
Hopefully this helps.
Cheers
Maas