An engineer is the person in charge of a train, not a collage degree holding designer of products.
My college diploma begs to differ.
Also, Merriam-Webster dictionary:
en·gi·neer noun \ˌen-jə-ˈnir\
: a person who has scientific training and who designs and builds complicated products, machines, systems, or structures : a person who specializes in a branch of engineering
: a person who runs or is in charge of an engine in an airplane, a ship, etc.
: a person who runs a train