The corporate descriptor has it about right regarding this brief (67 minutes) documentary. "3 bands. 6 cities. 1 train, and thousands of miles of track..." The bands are the U. K.'s Mumford & Sons, Edward Sharpe & The Magnetic Zeros from down under and the Old Crow Medicine Show from Tennessee. The train stops and concert venues are Oakland, San Pedro (L. A.), Phoenix, Austin and New Orleans. I know I'm missing one. Maybe L. A. and San Pedro are considered separately.
In any case don't expect a concert film. It isn't. Certainly there is plenty of music, especially the final joyful 3 band collaboration on "This Train." The unrated film is the Amtrak equivalent of a PG Jack Kerouac "On the Road" film. We see the various bands practice, write songs together, jam and generally have a good time with various family members along for the ride. For this viewer, I enjoyed the gig in Austin when the Mumfords invited the Austin H. S. marching band to perform with them with the hit song, "The Cave." The kids were having a blast in front of thousands of fans.
The Blu ray version comes in 1080p with a 1.78:1 aspect ratio and includes a DTS-HD Master Audio 5.1 soundtrack as well as 2.0 PCM Stereo. They do a good job of transforming the folk, bluegrass and rock songs from the bands. The video and audio are both excellent. The package includes a DVD version with compressed Dolby Digital audio (5.1 and 2.0). Extras include an interview with the director Emmett Malloy and some of his photos as well as some deleted scenes.