Hansom cab : A light, low, two-wheeled covered carriage with the driver's seat elevated behind, the reins being passed over the top.

Example:


Taxonomy
hansom cab, cab, hansom cabs, Hansom, passengers, horse, Cab Company, Horse Drawn Vehicles, free encyclopedia, vehicle, driver, the doors, carriage, The Mystery of a Hansom Cab, Sherlock Holmes, coach, nineteenth-century London, roof.

Defination from the web:
hansom cab on display in the Mossman Collection, Luton, England. ... Originally known as the Hansom safety cab, its purpose was to combine speed with safety, with a low centre of gravity that was essential for safe ...