Klaus, years ago (Driving Digest Magazine, I think) had photo & text about one horse pulling a wagon with a tongue. I suppose that with a stay chain and a neck yoke one horse could pull and turn/steer a wagon. But, how in heck could the horse "brake"/stop the wagon and how in heck would the other end of the neck yoke be fastened??? Thanks, kelly

Kelly, driving one horse on the left side of the tongue of a wagon was the usual way for one-horse farmers in Bavaria when I grew up. First, the tongue is a stiff one, in other words , it doesn't swivel up and down. Second , there is no neck yoke, from the two rings on the collar there extends a chain to the tip of the tongue which will hold the wagon back. I had never seen a wagon without a hand brake ( either lever or crank) . Most harnesses didn't even have a breeching, but the collar was heavy enough to help the horse hold back the wagon.Usually there was a crupper.
I hope that explanation helps. I have pictures here driving that way but haven't mastered the art yet of putting them on the website.

The pics I have seen of the gypsies in Rumania, had a chain running from the end of the evener to the end of the stiff tounge and chain running from end of tounge to collar. No brakes reqired.

On my wagon the evener was held by two rods, one perpendicular to the tongue to the middle of the evener and the other one running back from the middle to the evener to the middle of the front axle, thereby shaping a triangle.
Dale , I always used brakes to make it easier on the horse in our hilly countryside since I hauled not only hay, but also oats, firewood and even coal.

The Rumnians had flat ground.