It was A-ha's third consecutive top ten single in the UK, reaching No. 8. It was not a pop hit in the United States, but a 12" single featuring a remix of the song appeared on the Hot Dance Club Play charts. The single sold 500,000 copies worldwide. Another remix by Steve Thompson was released in 1986.
The music video was directed by Candice Reckinger and Michael Patterson. The video concept was designed by the same producers who brought "Take on Me" into the video mainstream. The black-and-white footage and animation in the "Train of Thought" video actually predated the "Take on Me" single, and was the inspiration for the animation in the "Take on Me" video. It originated as Michael Patterson's student film at CalArts, which went on to influence a generation of MTV videos.
Most of the video was the old animated footage, interspersed with live parts with A-ha filmed during a break in the band's tour.