Blast to the Future!
The Futuron Monorail is here!

Relive 1988 with this classic LEGO Space set. Featuring 731 pieces and 5 minifigs for interstellar adventures.

LEGO Monorail Transport System set 6990 - 731 pieces, Futuron theme, product photo Pin It
LEGO Monorail Transport System set 6990
🏛 Futuron
Set #6990

Monorail Transport System

The Monorail Transport System is a nostalgic trip back to the futuristic world of LEGO Futuron.

🏆 Best For: Ideal for LEGO fans who enjoy vintage sets and unique building experiences, especially those nostalgic for the Futuron theme. ⏱ 4.5 hr build 🧩 731 pcs
★★★★☆ 4.7

A highly coveted set among collectors for its iconic design and nostalgic value. While the original motor can be unreliable, the overall aesthetic and rarity make it a prized possession.

MSRP
$129.99
Best Price
$116.99
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📝 Our Take

The Monorail Transport System is a nostalgic trip back to the futuristic world of LEGO Futuron. Released in 1988, this set captures the essence of space exploration with its sleek monorail design and vibrant color scheme, a true icon of classic LEGO.

This set is perfect for LEGO enthusiasts who appreciate vintage themes and unique building experiences. The monorail system offers a fun and engaging build, and the completed model makes for a fantastic display piece that will spark conversations.

Skip this if you're primarily interested in modern building techniques or play features. While charming, its age shows in its simple construction compared to today's sets. Consider the newer LEGO City trains for more advanced functionality.

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What is the best way to maintain the original monorail motor? How does this set compare to modern LEGO train systems? What are the key factors that influence the value of this set in the secondary market? Where is the best place to display this vintage LEGO set?

🧱 Building Experience

🧩
731
Pieces
⏱
4.5h
Build Time
📊
Intermediate
Difficulty
Build Highlights:
  • Building the monorail track and support structure
  • Assembling the motorized monorail train
  • Integrating the train station with the monorail system
  • Futuristic design elements and color scheme

📈 Investment Analysis

↑ Trending up since release
A
Investment Grade
⏳ Appreciating
The Monorail Transport System (6990-1) presents a compelling investment opportunity due to its age, rarity, and iconic status within the LEGO Futuron theme. As a retired set from 1988, it's increasingly difficult to find in good condition, driving up its value. The Futuron theme itself has a dedicated following, further enhancing its collectibility. However, potential investors should be aware of the high initial cost and the risk of motor malfunction due to age. Proper storage and maintenance are crucial to preserving its value.

Not Financial Advice: Content is for educational purposes only. Past performance doesn't guarantee future results. Full disclaimer

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Compared to modern LEGO train sets, the Monorail Transport System offers a unique, vintage building experience. While lacking the advanced features of newer sets like remote control and Power Functions, its retro charm and historical significance make it a standout piece. For collectors seeking a more modern train experience, consider LEGO City trains. However, for those nostalgic for classic LEGO space themes, the Monorail is a must-have.

2 Minifigures Included

Futuron Spaceman, Yellow with Airtanks and Dark Blue Visor
Futuron Spaceman, Yellow with Airtanks and Dark Blue Visor
3x included
Futuron Spaceman, Blue with Airtanks and Dark Blue Visor
Futuron Spaceman, Blue with Airtanks and Dark Blue Visor
2x included
A
The set includes five classic Futuron minifigures with airtanks and dark blue visors, which are highly sought after by collectors due to their vintage and rarity.
Browse All Minifigures → | Best Investment Minifigs

📦 Full Parts Inventory - 118 unique parts • 701 total pieces

Windscreen 4 x 4 x 2 Canopy Extender, Hinge Windscreen 4 x 4 ...
Part #: 2337 1× Trans-Dark Blue
Equipment Control Panel Equipment Control...
Part #: 2342 3× White
Brick 2 x 2 Corner Brick 2 x 2 Corner
Part #: 2357 1× Black
Brick 2 x 2 Corner Brick 2 x 2 Corner
Part #: 2357 4× White
Wedge Plate 10 x 10 with 4x4 Cutout and Cut Corner Wedge Plate 10 x ...
Part #: 2401 2× White
Panel 10 x 6 x 11 Panel 10 x 6 x 11
Part #: 2408 1× Trans-Dark Blue
Panel 10 x 10 x 12 Quarter Dome Panel 10 x 10 x 1...
Part #: 2409 2× Trans-Dark Blue
Plate 2 x 2 Corner Plate 2 x 2 Corner
Part #: 2420 4× White
Bracket 2 x 2 - 1 x 4 Bracket 2 x 2 - 1...
Part #: 2422 1× Black
Technic Rack Winder [Complete Assembly] Technic Rack Wind...
Part #: 2426c01 1× Black
Technic Rack Winder [Complete Assembly] Technic Rack Wind...
Part #: 2426c01 1× White
Technic Rack 1 x 20 x 2/3 Technic Rack 1 x ...
Part #: 2428 2× White
Tile 1 x 4 with Groove Tile 1 x 4 with G...
Part #: 2431 1× White
Tile 1 x 4 with Groove Tile 1 x 4 with G...
Part #: 2431 2× Black
Bracket 1 x 2 - 1 x 4 [Square Corners] Bracket 1 x 2 - 1...
Part #: 2436 4× Black
Bracket 1 x 2 - 1 x 4 [Square Corners] Bracket 1 x 2 - 1...
Part #: 2436 2× White
Panel 3 x 2 x 5 2/3 Panel 3 x 2 x 5 2/3
Part #: 2448 2× White
Panel 3 x 2 x 5 2/3 Panel 3 x 2 x 5 2/3
Part #: 2448 2× Trans-Dark Blue
Brick Sloped Inverted 75° 2 x 1 x 3 Brick Sloped Inve...
Part #: 2449 4× White
Wedge Plate 3 x 3 Cut Corner Wedge Plate 3 x 3...
Part #: 2450 2× White
Vehicle Track, Monorail Track Straight Long Vehicle Track, Mo...
Part #: 2671 2× Light Gray
Vehicle Track, Monorail Curve Long Vehicle Track, Mo...
Part #: 2672 4× Light Gray
Vehicle Track, Monorail Ramp Lower Part Vehicle Track, Mo...
Part #: 2677 2× Light Gray
Vehicle Track, Monorail Track Ramp Upper Part Vehicle Track, Mo...
Part #: 2678 2× Light Gray
Support 4 x 4 x 5 Stanchion, Tall Studs Support 4 x 4 x 5...
Part #: 2680 2× Black
Support 6 x 6 x 10 Stanchion Support 6 x 6 x 1...
Part #: 2681 8× Black
Motor, Monorail 9V with Short Couplings [Complete Assembly] Motor, Monorail 9...
Part #: 2684c01a 1× White
Wheel Holder, Monorail Bogey with Bogey Bracket/Pivot Wheel Holder, Mon...
Part #: 2686c01 2× Black
Vehicle Base, Monorail 4 x 20 Vehicle Base, Mon...
Part #: 2687 2× Black
Vehicle Track, Monorail Monoswitch Vehicle Track, Mo...
Part #: 2774 2× Light Gray
Lever Small Base with Black Lever Lever Small Base ...
Part #: 298c02 4× Black
Brick 2 x 4 Brick 2 x 4
Part #: 3001 1× Black
Brick 2 x 3 Brick 2 x 3
Part #: 3002 2× Black
Brick 2 x 2 Brick 2 x 2
Part #: 3003 8× Black
Brick 2 x 2 Brick 2 x 2
Part #: 3003 4× White
Brick 1 x 2 Brick 1 x 2
Part #: 3004 8× Black
Brick 1 x 2 Brick 1 x 2
Part #: 3004 23× White
Brick 1 x 2 with Black Grill Print Brick 1 x 2 with ...
Part #: 3004pr9981 2× White
Brick 1 x 1 Brick 1 x 1
Part #: 3005 4× Black
Brick 1 x 1 Brick 1 x 1
Part #: 3005 4× White
Brick 1 x 8 Brick 1 x 8
Part #: 3008 4× White
Brick 1 x 6 Brick 1 x 6
Part #: 3009 3× Black
Brick 1 x 6 Brick 1 x 6
Part #: 3009 4× White
Brick 1 x 4 Brick 1 x 4
Part #: 3010 5× White
Brick 1 x 4 Brick 1 x 4
Part #: 3010 5× Black
Plate 2 x 4 Plate 2 x 4
Part #: 3020 1× Black
Plate 2 x 4 Plate 2 x 4
Part #: 3020 1× White
Plate 2 x 3 Plate 2 x 3
Part #: 3021 1× White
Plate 2 x 3 Plate 2 x 3
Part #: 3021 2× Black
Plate 2 x 2 Plate 2 x 2
Part #: 3022 15× Black
Plate 2 x 2 Plate 2 x 2
Part #: 3022 7× White
Plate 1 x 2 Plate 1 x 2
Part #: 3023 45× White
Plate 1 x 2 Plate 1 x 2
Part #: 3023 5× Black
Plate 1 x 1 Plate 1 x 1
Part #: 3024 8× Trans-Red
Plate 1 x 1 Plate 1 x 1
Part #: 3024 2× White
Plate 2 x 8 Plate 2 x 8
Part #: 3034 7× White
Plate 4 x 8 Plate 4 x 8
Part #: 3035 3× Black
Brick Sloped 45° 2 x 4 Brick Sloped 45° ...
Part #: 3037 2× White
Brick Sloped 45° 2 x 2 Brick Sloped 45° ...
Part #: 3039 4× White
Brick Sloped 45° 2 x 2 Brick Sloped 45° ...
Part #: 3039 1× Black
Brick Sloped 45° 2 x 2 with 12 Buttons, 3 Red Lamps, Black Panel Print Brick Sloped 45° ...
Part #: 3039pr9996 2× White
Brick Sloped 45° 2 x 1 with Bottom Pin Brick Sloped 45° ...
Part #: 3040b 4× Black
Brick Sloped 45° 2 x 1 with Bottom pin, with 9 Large + 3 Small Black Buttons Print Brick Sloped 45° ...
Part #: 3040bpr0010 2× White
Brick Round 1 x 1 Open Stud Brick Round 1 x 1...
Part #: 3062b 2× Black
Brick Round 1 x 1 Open Stud Brick Round 1 x 1...
Part #: 3062b 4× Trans-Red
Tile 2 x 2 with Groove Tile 2 x 2 with G...
Part #: 3068b 1× Black
Tile 2 x 2 with Groove Tile 2 x 2 with G...
Part #: 3068b 6× White
Tile 2 x 2 with Grill Black Print Tile 2 x 2 with G...
Part #: 3068bpr0031 2× White
Tile 2 x 2 with Arrow Thin Yellow with Black Border Print Tile 2 x 2 with A...
Part #: 3068bpr0032 2× White
Tile 1 x 2 with Groove Tile 1 x 2 with G...
Part #: 3069b 14× White
Tile 1 x 2 with Groove Tile 1 x 2 with G...
Part #: 3069b 12× Black
Tile 1 x 2 with Arrow Long Yellow with Black Border Print Tile 1 x 2 with A...
Part #: 3069bpr0023 6× White
Tile 1 x 1 with Groove Tile 1 x 1 with G...
Part #: 3070b 3× White
Tile 1 x 1 with Red and Black Buttons Print Tile 1 x 1 with R...
Part #: 3070bpr0031 1× White
Tile 1 x 1 with Computer Targeting Display Print Tile 1 x 1 with C...
Part #: 3070bpr0039 1× White
Brick Sloped 33° 3 x 2 Brick Sloped 33° ...
Part #: 3298 1× Black
Plate 1 x 8 Plate 1 x 8
Part #: 3460 10× White
Plate 1 x 3 Plate 1 x 3
Part #: 3623 4× Black
Plate 1 x 3 Plate 1 x 3
Part #: 3623 2× White
Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Brick Sloped Inve...
Part #: 3660 2× White
Brick Sloped Inverted 45° 2 x 1 Brick Sloped Inve...
Part #: 3665 4× White
Plate 1 x 6 Plate 1 x 6
Part #: 3666 2× Black
Turntable 2 x 2 Plate - Top Turntable 2 x 2 P...
Part #: 3679 2× Light Gray
Turntable 2 x 2 Plate, Base Turntable 2 x 2 P...
Part #: 3680 1× Black
Turntable 2 x 2 Plate, Base Turntable 2 x 2 P...
Part #: 3680 1× White
Brick Sloped 75° 2 x 2 x 3 [Hollow Studs] Brick Sloped 75° ...
Part #: 3684 2× White
Plate 1 x 4 Plate 1 x 4
Part #: 3710 3× Black
Plate 1 x 4 Plate 1 x 4
Part #: 3710 25× White
Plate 1 x 4 Plate 1 x 4
Part #: 3710 24× Light Gray
Technic Plate 2 x 8 [7 Holes] Technic Plate 2 x...
Part #: 3738 1× White
Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Plate Special 1 x...
Part #: 3794a 6× Black
Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Plate Special 1 x...
Part #: 3794a 2× White
Plate 2 x 6 Plate 2 x 6
Part #: 3795 9× White
Baseplate 32 x 32 Baseplate 32 x 32
Part #: 3811 1× Light Gray
Plate 2 x 10 Plate 2 x 10
Part #: 3832 8× White
Baseplate 16 x 32 Baseplate 16 x 32
Part #: 3857 1× Light Gray
Hinge Brick 1 x 2 Base Hinge Brick 1 x 2...
Part #: 3937 12× White
Hinge Brick 1 x 2 Top Plate Thin Hinge Brick 1 x 2...
Part #: 3938 12× White
Support Round 2 x 2 x 2 Stand with Blocked Center Hole Support Round 2 x...
Part #: 3940a 1× Black
Support Round 2 x 2 x 2 Stand with Blocked Center Hole Support Round 2 x...
Part #: 3940a 8× White
Brick Round 2 x 2 with Axle Hole Brick Round 2 x 2...
Part #: 3941 12× Black
Brick Round 2 x 2 with Axle Hole Brick Round 2 x 2...
Part #: 3941 2× Light Gray
Brick Round 2 x 2 with Axle Hole Brick Round 2 x 2...
Part #: 3941 3× White
Bracket 2 x 2 - 2 x 2 Bracket 2 x 2 - 2...
Part #: 3956 6× White
Antenna 1 x 4 with Rounded Top Antenna 1 x 4 wit...
Part #: 3957a 2× White
Antenna 1 x 4 with Rounded Top Antenna 1 x 4 wit...
Part #: 3957a 4× Black
Antenna 1 x 4 with Rounded Top Antenna 1 x 4 wit...
Part #: 3957a 2× Trans-Dark Blue
Antenna 1 x 4 with Rounded Top Antenna 1 x 4 wit...
Part #: 3957a 2× Trans-Red
Weapon Gun / Torch (Space) [with Grooves] Weapon Gun / Torc...
Part #: 3959 1× Black
Dish 4 x 4 Inverted [Radar] Dish 4 x 4 Invert...
Part #: 3960 4× White
Equipment Radio [Compact Handle] Equipment Radio [...
Part #: 3962a 1× Black
Tool Screwdriver and Spanner / Wrench Tool Screwdriver ...
Part #: 4006 1× Black
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Plate Round 2 x 2...
Part #: 4032a 8× Black
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Plate Round 2 x 2...
Part #: 4032a 2× White
Window 1 x 2 x 3 Train Window 1 x 2 x 3 ...
Part #: 4035 2× White
Brick Special 1 x 1 with Headlight Brick Special 1 x...
Part #: 4070 4× Black
Brick Special 1 x 1 with Headlight Brick Special 1 x...
Part #: 4070 2× White
Plate Special 1 x 1 with Clip Light, Bar Hole [Thick Ring] Plate Special 1 x...
Part #: 4081b 8× Black
Plate Special 1 x 1 with Clip Light, Bar Hole [Thick Ring] Plate Special 1 x...
Part #: 4081b 8× White
Tile Round 2 x 2 with Yellow Arrow with Black Border Print Tile Round 2 x 2 ...
Part #: 4150pr0016 2× Light Gray
Tile 1 x 8 with Groove Tile 1 x 8 with G...
Part #: 4162 9× White
Tile 1 x 8 with Groove Tile 1 x 8 with G...
Part #: 4162 2× Black
Plate Special 1 x 2 with Ladder Plate Special 1 x...
Part #: 4175 1× Black
Engine, Strakes, 2 x 2 Thin Top Plate Engine, Strakes, ...
Part #: 4229 4× Black
Hinge Plate 1 x 2 with 3 Fingers [Hollow Studs] Hinge Plate 1 x 2...
Part #: 4275b 4× White
Hinge Plate 1 x 2 with 2 Fingers and Hollow Studs Hinge Plate 1 x 2...
Part #: 4276b 4× White
Plate 2 x 16 Plate 2 x 16
Part #: 4282 1× Black
Dish 6 x 6 Inverted, Radar / Webbed [No Anti-studs] Dish 6 x 6 Invert...
Part #: 4285a 3× White
Hinge Vehicle Roof Holder 1 x 4 Hinge Vehicle Roo...
Part #: 4315 2× White
Equipment Camera with Side Sight [aka Space Gun] Equipment Camera ...
Part #: 4360 1× Black
Brick Sloped 75° 2 x 1 x 3 with Open Stud Brick Sloped 75° ...
Part #: 4460a 4× White
Windscreen 6 x 4 x 2 Canopy Windscreen 6 x 4 ...
Part #: 4474 2× Trans-Dark Blue
Support 2 x 4 x 5 Stanchion Inclined [5mm wide posts] Support 2 x 4 x 5...
Part #: 4476b 2× Black
Support 2 x 4 x 5 Stanchion Inclined [5mm wide posts] Support 2 x 4 x 5...
Part #: 4476b 6× White
Plate 1 x 10 Plate 1 x 10
Part #: 4477 1× Black
Plate 1 x 10 Plate 1 x 10
Part #: 4477 2× White
Cone 1 x 1 [No Top Groove] Cone 1 x 1 [No To...
Part #: 4589 8× Trans-Dark Blue
Cone 1 x 1 [No Top Groove] Cone 1 x 1 [No To...
Part #: 4589 4× White
Cone 1 x 1 [No Top Groove] Cone 1 x 1 [No To...
Part #: 4589 2× Black
Cone 1 x 1 [No Top Groove] Cone 1 x 1 [No To...
Part #: 4589 8× Trans-Red
Plate Special 1 x 4 Offset with Bar Holes Plate Special 1 x...
Part #: 4590 2× Black
Brick Special 1 x 2 x 2/3 with Studs on Sides Brick Special 1 x...
Part #: 4595 4× Black
Plate Special 1 x 2 with Long Stud Receptacle (Space Wing) Plate Special 1 x...
Part #: 4596 6× White
Bracket 3 x 2 - 2 x 2 [aka Space Seat] Bracket 3 x 2 - 2...
Part #: 4598 1× White
Bracket 3 x 2 - 2 x 2 [aka Space Seat] Bracket 3 x 2 - 2...
Part #: 4598 1× Black
Plate Special 1 x 2 with Bar Up [Horizontal Arm 6mm] Plate Special 1 x...
Part #: 4623 2× Black
Bar 1 x 3 [Clip / Anti-Stud] Bar 1 x 3 [Clip /...
Part #: 4735 4× Black
Dish 2 x 2 Inverted [Radar] Dish 2 x 2 Invert...
Part #: 4740 16× White
Dish 2 x 2 Inverted [Radar] Dish 2 x 2 Invert...
Part #: 4740 5× Trans-Red
Dish 2 x 2 Inverted [Radar] Dish 2 x 2 Invert...
Part #: 4740 1× Trans-Dark Blue
Battery Box, 9V Small [Complete Assembly] with '9V' Print Battery Box, 9V S...
Part #: 4760c01pr0001 1× White
Light Brick 1 x 2 [Single Bulb] Light Brick 1 x 2...
Part #: 4767 1× White
Brick Round 1 x 1 x 2/3 Light Bulb Cover Brick Round 1 x 1...
Part #: 4770 1× Trans-Red
Panel 1 x 2 x 2 [Solid Studs] Panel 1 x 2 x 2 [...
Part #: 4864a 4× Trans-Dark Blue
Panel 1 x 2 x 1 [Square Corners] Panel 1 x 2 x 1 [...
Part #: 4865a 20× White
Brick Sloped Inverted 45° 4 x 2 Double with 2 x 2 Recessed Brick Sloped Inve...
Part #: 4871 2× White
Wire with Brick 2 x 2 x 1/3 Pair, 15L Wire with Brick 2...
Part #: 5306ac015 1× Black
Plate Round 1 x 1 with Solid Stud Plate Round 1 x 1...
Part #: 6141 10× Trans-Red
Plate Round 1 x 1 with Solid Stud Plate Round 1 x 1...
Part #: 6141 6× Trans-Dark Blue
Flexible Hose 8.5L with Tabless Ends (Ends same color as Tube) Flexible Hose 8.5...
Part #: 73590c01a 4× White
Flexible Hose 8.5L with Tabless Ends (Ends same color as Tube) Flexible Hose 8.5...
Part #: 73590c01a 2× Black
Hinge Plate 1 x 4 Swivel Top / Base - Solid Clip [Complete Assembly] Hinge Plate 1 x 4...
Part #: 73983 1× White
This set is a great source of white plates and bricks, essential for space-themed MOCs, along with the rarer black stanchions which provide structural support.

🛒 Where to Buy

eBay
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💎 Notable Parts

White Plate 1 x 2 (45x) $2.25
White Plate 1 x 4 (25x) $1.25
Black Support 6 x 6 x 10 Stanchion (8x) $4.00
White Dish 2 x 2 Inverted [Radar] (16x) $4.00
Est. BrickLink Part Value
$11.50

💡 MOC Potential

🏙 Expand the monorail system with additional stations and track layouts.
🚀 Create a futuristic spaceport with the monorail as its transportation hub.
🚗 Design alternative monorail cars or maintenance vehicles.

Related Articles

📰 Futuron News

View all news

Community Insights

Real opinions from Reddit and YouTube

What Reddit Says

No Reddit discussions found for this set.

What YouTubers Say

1 video found
BlockTalk AI

The Daily Compulsion's review of the 6991 Monorail Transport Base praises the set's features, including the track system, motor mechanics, and minifigures. The reviewer also highlights the stickers and instructions, emphasizing the set's overall appeal.

YouTube thumbnail: LEGO Speed Build: 6991 Monorail Transport Base

LEGO Speed Build: 6991 Monorail Transport Base

The Daily Compulsion • 2.8K views Review
Community insights from Reddit discussions and YouTube reviews. Content may not reflect official LEGO positions.

What the Community Says

1 YouTube reviews
BlockTalk AI Summary

The Daily Compulsion's review of the 6991 Monorail Transport Base praises the set's features, including the track system, motor mechanics, and minifigures. The reviewer also highlights the stickers and instructions, emphasizing the set's overall appeal.

Reddit Reviews

No Reddit reviews found

YouTube Reviews

1 video
YouTube thumbnail: LEGO Speed Build: 6991 Monorail Transport Base

LEGO Speed Build: 6991 Monorail Transport Base

The Daily Compulsion
2.8K views Review
Community Content: These reviews are from Reddit and YouTube users sharing their personal experiences. Opinions may vary.

Charts Inventory Statistics

118
Unique Parts
701
Total Pieces
5
Minifigures
Inventory Version: 2

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