Country music legend Willie Nelson has reportedly signed on for this year's Railroad Revival Tour, which kicks off October 20th in Duluth, Georgia and runs through October 28th in Oakland, California.  Joining Nelson on this year's jaunt will be comedian/musician John Reilly and Friends, Band of Horses and Jamey Johnson.  The artists will meet up on vintage railroad cars, which will carry them across the country, stopping for open-air concerts in parks, fields and other venues close to the tracks.  Stops are also scheduled in Memphis, Tennessee; Oklahoma City; Old Spring Town, Texas; Tempe, Arizona and San Pedro, California.  Tickets for the train trip will go on sale Friday morning.  Last year's railroad tour featured Mumford & Sons, and a documentary ("Big Easy Express") detailing their trip was released today.