AN EMPLOYEE WAS TRAVELING THE RENTAL TIE INSERTER (R3652). WHILE MOVING THE TIE INSERTER, THE LEFTSIDE WORK HEAD CAME IN CONTACT WITH THE BRIDGE KNEE BRACE (BR107.7), CAUSING DAMAGE TO BOTH THE BRIDGE AND THE MACHINE. INVESTIGATION REVEALED: THE EMPLOYEE FAILED TO ENSURE THE EXCHANGER ARMS WERE LOCKED PRIOR TO TRAVEL. THIS ACTION ALLOWED THE ARM TO EXTEND UNKNOWINGLY