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6921 Monorail Accessory Track is an accessory set for 6990 Monorail Transport System and was released in 1988. It contains ten straight and curved Monorail track pieces, sixteen long and short support struts and 20 1x4 plates as connectors for the track pieces.
- The instruction booklet features four track plans that illustrate ideas on how to combine the elements of this set with the tracks from 6990 Monorail Transport System.
|Space sets released in 1988|
1530 Bonus Pack | 6703 Space Minifigures | 6770 Lunar Transporter Patroller | 6828 Twin-Winged Spoiler | 6848 Strategic Pursuer | 6875 Hovercraft | 6876 Alienator | 6885 Crater Crawler | 6921 Monorail Accessory Track | 6925 Interplanetary Rover | 6987 Message-Intercept Base | 6990 Monorail Transport System
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