They are now the only remaining engines of their type in existence today.

Theirs was not the only engine disturbing the Aegean night.

"We were the only engine that would go in there, because the brush had grown right up to the house."

Vasimr is not the only engine being considered for a mission.

For 1928 and 1929 the eights were the only engines used.

In California, the 351 was the only engine available.

The first of the class, No 1 is the only engine to be preserved.

This is the only engine available in the American market.

We were, you might say, almost the only engine in this whole process.

In the end this was the only engine installed.