In a ship, an engine room is where
the main engine(s), generators, compressors,
pumps, fuell lubrication oil purifiers and
other major machinery are located.

It is some times referred to as the "machinery
space".

Engine rooms are typically towards the stern,
or rear, of the boat from the crews living
accomodations.

On modern ships, a sound-proofed, air-conditioned
engine control room (ECR) Is situated next
to the engine room (ER), for the ship's
machinery control system.


Author : wikipedia