A grain cart is a huge tank on a huge pair of tires. It holds harvested grain.
It is pulled by a powerful tractor.
The semi can usually hold about 4 to 5 grain-cart-loads.
Four wheelers are now used instead of horses. They can go a lot faster and don't need to be fed or cleaned.
Most four wheelers can go as fast as 40mph.
The four wheelers can brake down though.
Silage is corn or cane plants chopped up into fine pieces.
It is chopped up by a silage cutter.
The crop is gathered up into the rollers by a header. The rollers feed the corn or cane into the small blades which spin at a very fast rate of speed. The chop up the stalks and all into bits. It is then fed into a blower that shoots it out the spout into the wagon. When the wagon is full, a truck pulls up beside it. The wagon tips sideways and the top flips up. All the newly cut silage falls into the truck, which pulls away and dumps it onto a pile.
An auger is composed of a huge round tube, made of metal, with a massive drill bit inside.
A motor at the end spins the drill bit.
The end of the auger is stuck into a bin and the grain travels up the big tube. It then drops down into a tandem truck or semi. The semi or tandem usually goes to a feedlot or an elevator.