Train's 2009 single "Hey, Soul Sister" has been certified diamond by the Recording Industry Association of America as of April 7.
"Hey, Soul Sister" was released August 11, 2009, but the song exclusively debuted on Billboard the day before. It was the rock band's first single in more than three years and the first single from their fifth album Save Me, San Francisco. The song's diamond status means it has moved 10 million units. According to the RIAA, one equivalent song unit is equal to a single digital song sale, or 150 on-demand audio and/or video streams.
"Got this today in the cybermail. Thank you everyone for this insanely cool honor," Train tweeted on Friday. "Soon we play it in person. Love and miss you all."