An engineer is a skilled person who uses scientific knowledge to design and construct machinery, electrical devices, or roads and bridges.
An engineer is also a person who repairs mechanical or electrical devices.
In American English, a person who drives a train is also called an engineer.
In British English, a person who drives a train is called an engine driver.
| Noun | 1. | engine driver - the operator of a railway locomotivemanipulator, operator - an agent that operates some apparatus or machine; "the operator of the switchboard" |