Hansom (hănsŭm), n., Hansom cab (kăb). [From the name of the inventor.] A light, low, two-wheeled covered carriage with the driver's seat elevated behind, the reins being passed over the top.
[1913 Webster]

He hailed a cruising hansom . . . “ 'Tis the gondola of London,” said Lothair. Beaconsfield.
[1913 Webster]