Bestworst's confident smile dropped from his face at the sound of the tractor engine.

The tractor engines were raving with the strain of the pull.

No one bothered speaking until she turned off the roaring tractor engine.

He started working on motors on his neighbor's tractor engine.

It made me think of a freshly tuned tractor engine.

Praying that his controls would still work, he worked the tractor engines to seize the mountain once again.

The tractor engine started in a rush of smoke.

The storm was so loud I couldn't hear the familiar knock of the tractor engine.

"I started playing with tractor engines as a boy."

An unusual feature was the placement of the twin tractor engines.