A postilion or postillion is a person who guides a horse-drawn coach or post chaise while mounted on the horse or one of a pair of horses. By contrast, a coachman controls the horses from the vehicle itself.
Postilions at the funeral of President Reagan, 2004
Postilions control the horses drawing the Queen's Coach at the State Opening of Parliament, London 2015
ANZAC horses and postilions struggle to move a gun, Passchendaele, 1917, by Harold Septimus Power
Royal Mews postilion livery
A coach is a large, closed, four-wheeled, passenger-carrying vehicle or carriage usually drawn by two or more horses controlled by a coachman, a postilion, or both. A coach has doors in its sides and a front and a back seat inside. The driver has a raised seat in front of the carriage to allow better vision. It is often called a box, box seat, or coach box. There are many of types of coaches depending on the vehicle's purpose.
Catherine II's carved, painted and gilded Coronation Coach (Hermitage Museum)
Ornate detail on one of the Portuguese Royal Coaches at the National Coach Museum in Lisbon
Coaches are nowadays also used on ceremonial occasions. Here, a coach is used to convey President Guðni Th. Jóhannesson of Iceland during a state visit to Sweden.
Coach of King John V of Portugal, 18th century