Answer:

engine

Answer	Crossword Clue
ENGINE	Word with steam or fire
ENGINE	Fuel-driven machine
ENGINE	Thomas, e.g.

ENGINE	Search ...
ENGINE	V-8
ENGINE	Locomotive
ENGINE	Word with fire or search
ENGINE	It'll get you going
ENGINE	Train mover
ENGINE	V-8, e.g.
ENGINE	Web search tool

ENGINE	Word with search or steam
ENGINE	It's often under a hood
ENGINE	Car puller
ENGINE	Search ..: online aid
ENGINE	It purrs when it's cared for
ENGINE	It may have a lot of pull
ENGINE	"I think I can, I think I can" speaker
ENGINE	Gas guzzler

ENGINE	Fire or steam follower
ENGINE	It may be gas-burning or hybrid
ENGINE	When it purrs, it's perfect
ENGINE	Place for a piston
ENGINE	Firehouse vehicle
ENGINE	It's tuned
ENGINE	Driving force
ENGINE	Driving force?

ENGINE	Search ..: online tool
ENGINE	Wankel's wonder
ENGINE	Motor
ENGINE	Choo-choo part
ENGINE	Power source
ENGINE	Fire ..
ENGINE	Casey Jones' spot
ENGINE	Car motor

ENGINE	Firefighter's vehicle
ENGINE	Glider's lack
ENGINE	Search software
ENGINE	It's always exhausted
ENGINE	Wankel, for one