Described by newspapers, quoting Karrier, in 1930 as a "mechanical horse" the small "Cob" tractor was designed by J Shearman, road motor engineer for London, Midland and Scottish Railway. Its small wheels let it turn in confined spaces and manoeuvre more easily in traffic. The front wheels are lifted from the ground when the tractor is attached and it was then classed as an articulated vehicle. It was capable of pulling a three-ton load at 18 mph and capable of restarting on a gradient of one in eight. Production tractors powered by Jowett engines were displayed on the Karrier stand at Olympia's Motor Transport Show. A Karrier "Cob" Major, a 4-ton three-wheeled tractor, was also displayed