Most of the guys around here combine like Ryan's pic's. Combine never stops, unload into the cart on the run and unload it into the semi on the ends of the field. Closest BIG grain elevator is about 6 miles from my house. Most years they have a pile of corn outside that would cover a football field 50 ft deep! PLUS another pile inside a special building at least that big, and several bins that must hold 50,000 bu. each
Tearing out all the RR tracks wasn't just a MI thing. The elevator DAD did business down in IL was on a RR track. They tore the tracks out in the 70's. A LOT of lumber, road oil for the road commissioner, grain, fertilizer, etc was hauled in/out of that little town of 100 ppl. In it's Heyday that town had three feed mills, a lumber yard, restaurant, general store, fertilizer co, tavern of course, bank, repair garage, elementary school, church, THREE trucking co's, and one of the largest FIREWORKS Mfg's in the USA.
Couple yrs ago, 4-5 maybe they built a HUGE grain loading termnal about 30-35 miles from where I grew up. They can load 100-car trains for feedlots & distilleries down south in about 8 hours. Semi's run into those terminals round the clock year round.
The BIGGEST CAT Lexicon combine is rated at 6000 bu./hr in good dry corn, that's about eight semi-loads an hour. I think JD has one about the same size. Not sure how C/IH's biggest one compares but I think it's a bit smaller, about 5000 bu/hr.