U.K. folk-rock quartet Mumford & Sons, the band of the moment in the U.S., will headline a six-date April tour with Edward Sharpe & the Magnetic Zeros and Old Crow Medicine Show that will hit outdoor sites in the West and Southwest via a specially outfitted train.

Rootsy trek, branded the Railroad Revival Tour, kicks off April 21 in Oakland and ends April 27 in New Orleans. It be filmed for a feature doc.

Acts will travel on a vintage train outfitted with 15 cars from the ’50s and ’60s and pulled by two locomotives. They will eat, sleep and record on the train, sharing equal billing and stage time on the tour.

Dates, which will eschew conventional venues, will include an April 22 stop at Ports O’ Call Village in the L.A. harbor city of San Pedro. Jaunt is a romantic throwback to 1970, when the Band, the Grateful Dead and Janis Joplin embarked on a brief, bibulous Canadian rail tour memorialized in Bob Smeaton’s 2003 feature “Festival Express.”

Mumford & Sons’ debut album “Sigh No More” has enjoyed a recent breakout after a year in release (Variety, Sept. 10); the set has climbed to No. 2 on the U.S. chart and sold more than 1 million copies. The band was nominated for the new artist Grammy this year and peformed at the February ceremony with Bob Dylan.

The Magnetic Zeros is a large gypsy-styled L.A. unit that has sold more than 200,000 copies of its debut “Up From Below” off constant touring. Old Crow Medicine Show is a New York-bred, Nashville-based neo-string band.

Tickets for the tour go on sale Wednesday exclusively via the Railroadrevivaltour.com website.