Triumph Roadster & TRX
Image courtesy of the Triumph Roadster Club secretary.
The advertisement for the Roadster 2000 appeared on the cover of Motor magazine in 1949. It replaced the 1800 cc unit.
The TRX, a.k.a. Roadster, was displayed at various Motor Shows in 1950 but was never actually produced. It was intended as a modern replacement for the 1800 and 2000 Roadster models. There is a photo of one of the two existing prototypes at http://www.kdb38.dial.pipex.com/roadster/roads6.htm