LEGO 6921 Monorail Accessory Track is a vintage Space set from 1988 valued at $556 for new and sealed sets, up 3618% from an original retail price of $14.95. Annual appreciation has averaged 7.70% since release. Used copies are valued between $175 and $246 depending on condition. Secondary market prices for new and sealed sets typically fall between $482 and $596.
LEGO 6921-1 Monorail Accessory Track is a Space Futuron set released in 1988, containing 46 pieces. It is an expansion pack for the Futuron monorail system and includes a selection of straight and curved monorail track, support struts, stanchion supports, and 1x4 plates used as connectors. The contents are intended to extend layouts built with 6990 Monorail Transport System, and the instruction booklet includes four track plans that show different ways to combine the two sets. The parts inventory includes long curved and long straight track sections, along with two short straight sections for layout variation.
A new and sealed Monorail Accessory Track is currently valued at around $556, with annual growth of approximately 5%. The average used price is $205 for those in good overall condition. Based on current trends, this set could be valued near $595 within the next year. New and sealed listings currently range from $502 to $596.