LEGO Monorail Transport Base 6991-1
LEGO Monorail Transport Base (6991-1) is worth about $3,029 on the secondary market today, against a $393 retail price. It has 573 pieces, belongs to the Space theme and was released in 1994. This set has retired — LEGO no longer produces it, so supply is fixed and prices are set entirely by the resale market.
- Set number
- 6991-1
- Theme
- Space
- Subtheme
- Unitron
- Year
- 1994
- Pieces
- 573
- Minifigures
- 4
- RRP
- $393
- Market value
- $3,029
- Used value
- $544
- Released
- 1994
- Retirement
- Retired
Minifigures in LEGO Monorail Transport Base
Monorail Transport Base value by year
From $1,255 in 2017 to $3,280 in 2026 so far: +161%. Its highest year was 2026, at $3,280.
| Year | Value | Change |
|---|---|---|
| 2026 (so far) | $3,280 | +1.7% |
| 2025 | $3,225 | +28.4% |
| 2024 | $2,512 | +48.8% |
| 2023 | $1,687 | +8.3% |
| 2022 | $1,558 | +3.5% |
| 2021 | $1,505 | −2.3% |
| 2020 | $1,542 | +10.4% |
| 2019 | $1,397 | +1.6% |
| 2018 | $1,374 | +9.5% |
| 2017 | $1,255 | — |
Median of each year's market prices, sealed, in US dollars.
What you are paying for
Its 3 priced minifigures are worth about $52 together, roughly 2% of the set's value — low for Space sets, so the value is in the sealed set rather than the figures (typically 11%).
Frequently asked questions
How much is LEGO Monorail Transport Base (6991-1) worth?
LEGO Monorail Transport Base is worth approximately $3,029 on the secondary market today, based on current listings and completed sales. BrickStats updates this value daily.
Is LEGO Monorail Transport Base retired?
Yes — Monorail Transport Base (6991-1) has been retired by LEGO and is no longer in production. Retired sets have fixed supply, which is why their prices are driven purely by the resale market.
Has LEGO Monorail Transport Base gone up in value?
Yes. Monorail Transport Base launched at $393 and now trades around $3,029, an increase of 670.6%. See the price history chart for how it got there.
What is the price per piece for Monorail Transport Base?
At its $393 retail price across 573 pieces, Monorail Transport Base works out to about $0.686 per piece. Collectors often use price per piece to judge whether a set is good value.
Is LEGO Monorail Transport Base a good investment?
Monorail Transport Base currently trades 670.6% above its $393 retail price, and it is retired, so no new supply is entering the market. Past performance is not a prediction — condition, packaging and how long you hold all affect what a set actually sells for. BrickStats reports the numbers rather than giving investment advice.
Why is LEGO Monorail Transport Base so expensive?
Monorail Transport Base was released in 1994 and has since retired. Once LEGO stops producing a set, the only supply is what is already in circulation, so sealed copies in good condition compete for a shrinking pool of stock. That scarcity, not the parts, is what moves the price.