High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! An operating engineer is a tradesman who operates heavy machinery. There are two main types of workers sharing this title and trade union affiliation (International Union of Operating Engineers). The first group are workers who operate steam plants or boilers. These are generally called stationary engineers but are known by other titles such as boiler operators, thermal technicians and power engineers. The second group is a larger class who drive and operate cranes and engineering vehicles such as bulldozers and graders used in construction and engineering projects.

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