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The highly successful 5 tonner was replaced by the Super in around 1920, and a direct development the DG4 appeared in 1926. This was quickly followed by a six wheeler (DG6) and a DG8 four axle version in 1929. This was called the first British eight legger as though in practise it carried no more than a six wheeler because of weight restrictions of the time. By 1930 there was pressure on the remaining steam road vehicle builders to upgrade, though Sentinel were able to introduce an improved S type as late as 1934, designated S4, S6 and S8. Production continued to some extent until the outbreak of the war.
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