sulky

A one-horse chaise or carriage, capable of holding but one person: called by the French a DESOBLIGEANT.

Sulky
·adj A light two-wheeled carriage for a single person. II. Sulky ·noun Moodly silent; sullen; sour;...

Webster's Dictionary of the English Language
sulky
A carriage for a single person; generally in the form of a chaise. He bought him a sulky and a fast...

Dictionary of American Words And Phrases by John Russell Bartlett.