The Rolls-Royce Silver Ghost refers both to a car model and to one specific car from that series.

Originally named the "40/50 h.p." the chassis

Chassis

A chassis consists of an internal framework that supports a man-made object. It is analogous to an animal's skeleton. An example of a chassis is the underpart of a motor vehicle, consisting of the frame with the wheels and machinery.- Vehicles :In the case of vehicles, the term chassis means the...

 was originally produced at Royce's Manchester

Manchester

Manchester is a city and metropolitan borough in Greater Manchester, England. According to the Office for National Statistics, the 2010 mid-year population estimate for Manchester was 498,800. Manchester lies within one of the UK's largest metropolitan areas, the metropolitan county of Greater...

 works, before moving to Derby

Derby

Derby , is a city and unitary authority in the East Midlands region of England. It lies upon the banks of the River Derwent and is located in the south of the ceremonial county of Derbyshire. In the 2001 census, the population of the city was 233,700, whilst that of the Derby Urban Area was 229,407...

 in July 1908 and also, between 1921 and 1926, in Springfield, Massachusetts

Springfield, Massachusetts

Springfield is the most populous city in Western New England, and the seat of Hampden County, Massachusetts, United States. Springfield sits on the eastern bank of the Connecticut River near its confluence with three rivers; the western Westfield River, the eastern Chicopee River, and the eastern...

. Chassis no. 60551, registered AX 201, was the car that was originally given the name "Silver Ghost." Other 40/50 hp cars were also given names but the Silver Ghost title was taken up by the press and soon all 40/50s were called by the name, a fact not officially recognised by Rolls-Royce until 1925 when the Phantom range was launched.

The Silver Ghost was the origin of Rolls-Royce's claim of making the "Best car in the world" – a phrase coined not by themselves, but by the prestigious publication Autocar

Autocar

Autocar is a weekly British automobile magazine published by Haymarket Motoring Publications Ltd. It refers to itself as "The World's oldest car magazine".-History:...

in 1907.

The chassis and engine were also used as the basis of a range of Rolls-Royce Armoured Car

Rolls-Royce Armoured Car

The Rolls-Royce armoured car was a British armoured car developed in 1914 and used in World War I and in the early part of World War II.-Production history:...

s.
In 1906, Rolls-Royce produced four chassis to be shown at the Olympia car show, two existing models, a four cylinder

Straight-4

The inline-four engine or straight-four engine is an internal combustion engine with all four cylinders mounted in a straight line, or plane along the crankcase. The single bank of cylinders may be oriented in either a vertical or an inclined plane with all the pistons driving a common crankshaft....

 20hp

Rolls-Royce 20 hp (1905)

The Rolls-Royce 20 hp was one of four cars to be produced as a result of an agreement of 23 December 1904 between Charles Rolls and Henry Royce. Badged as a Rolls-Royce, the 20 hp was produced during 1905 and 1906 by Royce's company, Royce Ltd. at its factory in Trafford Park, Manchester. It...

 and a six cylinder

Straight-6

The straight-six engine or inline-six engine is a six-cylinder internal combustion engine with all six cylinders mounted in a straight line along the crankcase...

 30hp

Rolls-Royce 30 hp

The Rolls-Royce 30 hp was one of four cars to be produced as a result of an agreement of 23 December 1904 between Charles Rolls and Henry Royce. Badged as a Rolls-Royce, the 30 hp was produced during 1905 and 1906 by Royce's company, Royce Ltd. at its factory in Trafford Park, Manchester. It...

, and two examples of a new car designated the 40/50 hp.