I'm not sure I'd say realistic per se, but Hearts of Iron 4's (WW2 grand strategy game) new logistics system is pretty good IMHO. You need to manufacture enough

I'm not sure I'd say realistic per se, but Hearts of Iron 4's (WW2 grand strategy game) new logistics system is pretty good IMHO. You need to manufacture enough of each war machine (with the necessary raw materials), then handle supply through railways, supply hubs (and trucks/horses from then on, depending on terrain, type and number of divisions and of course if you have enough trucks) and convoys if supplying overseas.