A Hansom cab was a type of carriage with two wheels. The passengers sat below the driver in a space which could be enclosed, and the driver sat above and behind the passengers.[source needed]
Li H'sen Chang and Mr Sin rode in a hansom cab while searching London. (TV: The Talons of Weng-Chiang)
A hansom cab passed between the Eleventh Doctor and Strax, Jenny and Vastra as he walked away from them. After the cab passed, the Doctor disappeared. (TV: The Great Detective)