WHILE MAKING AN EASTBOUND SHOVE MOVE ON DU02, ENGINEER ON THE L58691-19 STATED THAT SOMETHING FELT OFF AND STOPPED THEIR MOVEMENT. THE CONDUCTOR CAME TO THE HEAD END AND FOUND THE TBOX 663982, TRGX 855080 & TRGX 855089 DERAILED IN THE UPRIGHT POSITION. CAUSE WAS DETERMINED TO BE TRACK RELATED.