We had two horses, one between the shafts and wearing the inevitable yoke.

The other was outside, and attached to an iron single-tree over the forward wheel.

Three horses can be driven abreast on this kind of carriage.
The shaft horse trotted, while the other galloped, holding his head very low and turned outward.

This is due to a check rein, which keeps him in a position hardly natural.

The orthodox mode in Russia is to have the shaft horse trotting while the other runs as described; the difference in the motion gives an attractive and dashy appearance to the turnout.