[2] Post-war, the company used the profits from completion of work on the Teesside trolley system to purchase trolleybuses which had been in storage during the war.
[2] The general manager of the Teesside Railless Traction Board developed a new and improved trolleybus design and Clough Smith arranged for it to be manufactured It was marketed as the Straker-Clough trolley omnibus.
[2][3] The chassis was manufactured by Straker-Squire, the electrical equipment by British Thomson-Houston of Rugby, with Clough arranging the production of the bodies.
The completed product was sold to system operators as part of a package deal which included the design, supply and installation of the overhead electrical equipment.
By this time, Karrier had produced the UK's first three-axle passenger vehicle aided by developments in pneumatic tyres and Clough Smith themselves had moved to pneumatic-tyred production in November 1926 with a new LL (for low-loading) model.