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6347 Monorail Accessory Track (also 6347 Airport Shuttle Accessory Track) is an accessory set for 6399 Airport Shuttle (but also 6990 Monorail Transport System) and was released in 1991. It contains twelve straight or curved Monorail track pieces, two switchtracks (left and right) and ten support struts, as well as 30 1x4 plates as connectors for the track pieces.
- This set contained the first LEGO Monorail switchtracks. The only other set that included these pieces was 6991 Monorail Transport Base from 1994.
- The instruction booklet features several ideas on how to combine the elements of this set with the tracks from either 6399 Airport Shuttle or 6990 Monorail Transport System (four track plans each).