Gear trains are mechanisms that are used to transmit motion and power between shafts. They consist of a series of gears that are mounted on the shafts, and they are commonly used in a range of machines and mechanical systems. Some synonyms for gear train include cogwheel assembly, gearset, power transmission system, drivetrain, transmission assembly, and mechanical linkage. These terms are often used interchangeably to describe the same mechanism, and they all refer to the series of gears that work together to transmit motion and power. Regardless of the term used, gear trains are an essential component of many complex machines, and they continue to play a vital role in a wide range of industries.