Ransomes, Sims & Jefferies

This company was primarily an agricultural machine manufacturer - but they also made trolleybus chassis.

http://en.wikipedia.org/wiki/Ransomes,_Sims_%26_Jefferies

A 38-seater single-deck trolley bus with Park Royal metal body (Body No. B31688) mounted on Ransomes, Sims and Jefferies chassis.  It is one of a fleet of fourteen (delivered very slowly in 1947/8) operated in Trinidad, British West Indies, by the Port of Spain Electricity Board (Information courtesy of Michael Neal).

Click here for a hand coloured 'advert-version' of the external photograph.