A commuter train came alive with "The Sound of Music" as cast members of the show pulled off a flash-mob performance.

The cast caught a train in Brisbane where the show was being staged during its Australian tour.

Once they were underway, Amy Lehpamer who plays Maria, launched into "Do-Ri-Me," which passengers assumed was a solo performance. Little did they suspect the entire clan of von Trapp children were hiding among the rows.

Children from the cast began chiming in from around the train until they all joined with "Maria" to sing the chorus complete with choreographed moves.

Passenger Allport Millinery caught the unexpected show on video and posted it to Facebook, where it's become one of social media's "Favorite Things."

The surprised and amused passengers broke out in applause before the cast could even return to their seats.

(WATCH the video below) - Photo: Allport Millernery, Facebook video

First trip ever on the Brisbane trains and this happens! .... Just your average Thursday afternoon... A flashmob singing on the train. #thesoundofmusic #childhoodflashback #averagethursday Queensland Rail

Posted by Allport Millinery on Wednesday, March 23, 2016

First trip ever on the Brisbane trains and this happens! .... Just your average Thursday afternoon... A flashmob singing on the train. #thesoundofmusic #childhoodflashback #averagethursday Queensland Rail

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