Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 132,806 pages of information and 210,387 images on early companies, their products and the people who designed and built them.
Trojan of Kingston Works and later of Purley Way, Croydon produced commercial vehicles.
1914 Formed as a private company.
1928 Manufacture moved to the Purley works.
1937 New 15cwt model introduced with Bendix-Cowdray brakes.
1937 Manufacturers of aircraft components. 
1947 A completely new Senior 12/15cwt van produced with either a two-stroke or Perkins P3V engine. This model continued in production until the company ceased business.
1961 Employed 500 persons. Makers of Trojan motor vehicles and Trokart racing Karts. Manufacturers of Trojan motor vehicles, including small cars, commercial vehicles, aircraft components, agricultural equipment and Trokart racing karts. 
1963 Motor Show exhibitor. Showed Elva Courier sports models. 
1949 Single deck chassis with 15 feet 3 inch wheelbase
1953 A bus (Trojan DT) on a 7 feet 10 inch wheelbase was built with a Perkins engine
1954 Bus on a 9 feet 6 inch wheelbase and a Perkins 3 engine
1960 Two Trojan coaches were exhibited at Earls Court.
See Trojan: Cars
Trobike was a motorcycle produced from 1960 to 1965, by the Trojan works in Croydon, Surrey.
This was a mini-bike sold in kit form - thus avoiding purchase tax. Although it could be used for short trips on the road, the intended usage was in factories, on airfields, at race meetings, on big estates or any other large private area.
It had a 94cc Clinton two-stroke engine with an automatic 'Twist and Go’ centrifugal clutch to take the drive to the rear wheel. This was mounted in a simple frame without suspension, other than fat 5-inch tyres. It did around 30mph and 90-odd miles to the gallon.
This type of machine was fairly popular in the USA - less well-liked in the UK, it had but a short life. The company made approximately 550 of these machines.