Abstract: A traveler (slat carriage) for a vertical blind is provided with the carriage being movable within a support rail. The traveler includes a main body defining an interior space. The main body has an outer surface defining a gripping pocket. A toothed wheel is disposed in the interior space. A pivot pin is supported in the toothed wheel. The pivot pin and the toothed wheel are together pivotable about a vertical axis. The main body is held form an outside of the main body via the gripping pocket for assembly of the toothed wheel in the space and the pivot pin in the toothed wheel. The invention also provides a traveler (slat carriage) and rail assembly with a support rail, a group of travelers and a drive member. Each of the travelers includes a main body inserted into the rail. A drive member for moving the travelers within the support rail is provided for opening and closing the vertical blind. The drive member is inserted into an orifice of the main body, after assembly of the group of travelers.