In 1856 James & Henry pestered their father to build portable steam engines to provide power for their thrashing machines that they were selling in ever increasing numbers, and the first portable engine was manufactured in 1857. Due to the success of the portable engines, they were encouraged to manufacture stationary steam engines for use in the local mills in 1858.

    Marshalls manufactured their first self-moving under-type 6 NHP traction engine No. 4912 in September 1876 and was exhibited at the Smithfield Show. Although a further 3 under-type engines were built in the following months, it became clear after the Royal Show at Liverpool, that the under-type design was not being well received by the farming fraternity. In 1877 the first 3 conventional traction engines were built followed by traction wagons from around 1880. The light traction engine, aimed at the South American market, was introduced in 1906 and the smaller 5 ton steam tractor in 1911.    The first slide valve steam road roller, based on the 6NHP Traction engine, was built in 1894 for the newly created Gainsborough Urban District Council. The Millars Marshall tandem roller was introduced in 1923, the Class S steam roller in 1924 and the Universal steam roller in 1925. Living vans were introduced around 1900.

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