one-horse (carriage)
Used to describe a carriage or vehicle pulled by a single horse. Often appears in historical or literary contexts.
昔、一頭立ての馬車で町を回った。
Long ago, they toured the town in a one-horse carriage.
Compound of 一頭 (いっとう, 'one head (of an animal)') + 立て (だて, 'set up; arranged'). The reading だて is a rendaku form of たて.