The engine compartment on a freight train caught fire Wednesday on tracks north of Moreno Valley, leading to an acre-wide blaze that prompted a full closure of the rail line. The non-injury fire was reported at 3:45 p.m. along Union Pacific Railroad tracks near the intersection of Live Oak Canyon and San Timoteo Canyon roads, in an area of rugged terrain known as the Badlands, according to the Riverside County Fire Department. The agency said mu…