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Ursus A was a series of Polish lorries and buses. It was a license-built modification of the Italian SPA 25C Polonia trucks.
In 1924 the Polish government ordered a large series of license-built 3-ton Berliet CBA lorries and 1.5-ton SPA 25C Polonia trucks. Ursus was to deliver 1050 trucks in three batches of 200 Berliets and 150 SPAs each. The first batch was to be imported from France and Italy, the second locally assembled from imported parts, while the final batch was to be produced locally in Poland. The company started building a new factory in Czechowice near Warsaw to accommodate the new production lines, but construction was slow. Eventually the Polish Army agreed to buy 400 Berliets from France and allowed the Ursus company to focus on SPA production. On 11 July 1928 the first 52 Ursus A trucks left the factory.
Ursus A was basically a modification of the Italian truck, adapted to harsh Polish weather and poor roads. Initially modifications were minor, the basic difference was a larger payload (2.5 tons instead of 2) and a simplified cooler. Overtime additional modifications were added (notably three types of cabs), which led to a variety of variants being produced. Until 1931, when production was phased out in favour of Polski Fiat 621, 884 vehicles were delivered, including 509 for the civilian market.