STEAM ROAD ROLLER
A steamroller (or steam roller) is a form of road roller – a type of heavy construction machinery used for leveling surfaces, such as roads or airfields – that is powered by a steam engine. The leveling/flattening action is achieved through a combination of the size and weight of the vehicle and the rolls: the smooth wheels and the large cylinder or drum fitted in place of treaded road wheels.
The majority of steam rollers are outwardly similar to traction engines as many traction engine manufacturers later produced rollers based on their existing designs, and the patents owned by certain roller manufacturers tended to influence the general arrangements used by others. The key difference between the two vehicles is that on a roller the main roll replaces the front wheels and axle that would be fitted to a traction engine.
In many parts of the world, the term steam roller is still used to refer to a road roller, regardless of the method of propulsion. This typically only applies to the largest examples (used for road-making).
Britain was a large exporter of steam rollers to the world over the years, with the firm of Aveling and Porter probably being the most famous and the most prolific.
Many other traction engine manufacturers built steam rollers, but after Aveling and Porter, the most popular were Marshall, Sons & Co., John Fowler & Co., and Wallis & Steevens.
In America, the Buffalo-Springfield Roller Company was a large builder. J. I. Case made a roller variant of their famed farm engines, but had a small market share. Other nations had makers including the Czechs, Swiss, Swedes, Germans and Dutch which produced steam rollers.
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