A locking device for locking a wheel track (30) of a carton flow bed rack to an end beam (10; 20) of the carton flow bed rack in a mounting position includes a locking plate (50) for connecting the wheel track (30) to the end beam (10; 20) and a cover rail (40) for fixing the locking plate (50) to the wheel track (30). The locking plate (50) has a mounting end (51) configured to engage the end beam (10; 20) in the mounting position. The locking plate (50) further has an elongated protrusion (52) configured to protrude out of the end beam (10; 20) in the mounting position. The cover rail (40) is configured to encase at least partially both the protrusion (52) of the locking plate (50) and an end section of the wheel track (30) in the mounting position.