the engineer is the person that drives the train.
the engineer is the person that drives the train.
who is the person that drives the train?
engineer
railroad engineer









































an engineer (american and canadian), engine driver, loco pilot, motorman, train driver (british and commonwealth english), is a person who drives a train. the driver is in charge of, and responsible for driving the engine, as well as the mechanical operation of the train, train speed, and all train handling.
railroad engineer
before electric motors were invented, mechanical speed changers were used to control the mechanical power provided by water wheels and steam engines. when electric motors came into use, means of controlling their speed were developed almost immediately. today, various types of mechanical drives, hydraulic drives and electric drives compete with one another in the industrial drives market.









































section::::types of adjustable speed drives.:mechanical adjustable speed drives.









































there are two types of mechanical drives, variable pitch drives and traction drives.









































variable pitch drives are pulley and belt drives in which the pitch diameter of one or both pulleys can be adjusted.
adjustable-speed drive