First of all:
I got this idea from this video https://www.youtube.com/watch?v=pDLIkfSLTmU
I don't have the time or skill to redesign the exact train station used so here's a quick blueprint you can throw down if you want to fill a large artillery train.
the train as of now has 29 locomotives and 56 artillery wagons spaced 4 Locomotives in the front - 8 artillery - 5 loc - 7 artillery - 5 loc - 7 artillery - 5 loc - 7 artillery (repeating)
If the inventor of the real designs (loading stations and outpost) would show up and post the prints on this site I think a lot of people would enjoy that.
also we need new tags like /train/artillery wagon