How to get raw materials onto a train?

I have a simple train setup to move raw materials to a location close by to where they will be processed, but for some reason, I cannot move the raw mats to the train station, I do have all the vehicular connections set on both sides of the station with the intersection connection as well to it for entry and exit…Don’t know what else I can think of. some knowledge on this matter would be gracious, thank you.

You also need a factory that consumes the material to get the materials in the train.

Yeah I have part of the map just for that

Than make sure they’re connected.
Also check the districts.