"Breakthru" is a combination of two separate song ideas. The short piano intro, written by Freddie Mercury, called "A New Life is Born" was combined with the fast paced rocker song idea written by Roger Taylor.
It was Roger Taylor's idea to have the band perform the song on a moving locomotive in the music video.
Debbie Leng, the black masked woman who appears in the video, was Roger Taylor's girlfriend at the time.
The train was reportedly moving between 30 and 60 mph. Queen insured themselves for £2 million against bodily harm.
The music video cost £300,000 to make.