"Cool the Engines" is a song written by Tom Scholz, Brad Delp and Fran Sheehan that was originally released on Boston's 1986 album Third Stage. In the US it was also released as a 12" promotional single backed with another song from Third Stage, "The Launch," and as the B-side to the third commercially released single from the album, "Can'tcha Say (You Believe in Me)/Still in Love." It reached #4 on the Billboard Mainstream Rock chart.Blllboard also rated it as the #25 Top Rock Track of 1987. It was also included on Boston's 1997 compilation album Greatest Hits.

"Cool the Engines" was written and recorded during 1981 and 1982. Lead singer Delp described the recording of the song. He noted that often Scholz would write songs for Boston but since he was not a singer Delp had to adapt his singing style to Scholz' more keyboard or guitar-oriented arrangements. And often had the melody for Delp to sing before completing the lyrics. But for "Cool the Engines" the lyrics were complete and Delp had an idea for how to sing the song, and offered to try it out for Scholz. Scholz liked that first attempt that he did not want to re-record it in fear of losing that version, even though Delp thought he may be able to improve on it.

In developing "Cool the Engines," Scholz recorded drum tracks and cut up those recordings bar by bar, creating an effect that Musician magazine calls "a kind of analog drum machine that only a seasoned tape splicer would dare attempt," going on to claim that it "worked wonders" on this song. Scholz used the Rockman amplifier he invented to make his electric guitar sound like an "armada of axes." Milo Miles of the Boston Phoenix praises Scholz' guitar playing on the song, stating that his "scaling arpeggios and wallowing (decorously) in the lower register" is superior to the then current work of Scholz' idols, such as Jimmy Page.

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