This report describes and analyzes a rear-end collision between two Southern Pacific Transportation Company freight trains in the SP yard at Indio, California, on June 25, 1973. Extra 8992 West, after having entered the yard, struck the rear of Extra 8659 West, which was standing on the westbound main track. All five locomotive units of Extra 8992 West were destroyed, and 25 cars of the two colliding trains were derailed. The engineer and the front brakeman of Extra 8992 West were killed. Eight cars of a train on an adjacent track were also derailed.