How many pieces are in the Monorail Transport Base?

Monorail Transport Base contains 573 pieces.

When was the Monorail Transport Base released?

Monorail Transport Base was released in 1994.

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🏛 Unitron

Set #6991

Monorail Transport Base

The Monorail Transport Base is a nostalgic trip to LEGO's sci-fi golden age.

Before you buy

Who it's for: Intermediate build Ideal for LEGO fans aged 12+ who enjoy vintage space themes and are comfortable with some technical challenges.
Build: 573 pieces · about 4.5 hours Build time is an estimate.
Availability: Likely retired

★★★★☆ 4.6 AI-generated review score, not a customer rating

Fans praise the Monorail Transport Base for its nostalgic appeal and unique play features, especially the motorized monorail. However, some criticize the set for its age, noting that the electronic components may require maintenance and that finding replacement parts can be challenging.

Check price on eBay

📝 Our Take

AI-assisted editorial summary, grounded in our LEGO database and public community discussions. How we use AI

The Monorail Transport Base is a nostalgic trip to LEGO's sci-fi golden age. Released in 1994 under the Unitron theme, this set represents a blend of futuristic transportation and classic LEGO building, offering a unique play experience and a distinctive aesthetic.

This set is perfect for LEGO enthusiasts who appreciate vintage space themes and complex builds. The monorail system provides a dynamic element, while the base offers opportunities for imaginative play and display, making it a rewarding project for both builders and collectors.

Skip this if you prefer modern building techniques or are intimidated by the maintenance of vintage LEGO electronics. The monorail system may require some troubleshooting, and the color scheme might not appeal to everyone; consider newer space-themed sets like the City Space series for a more contemporary experience.

✨ New

Ask BlockTalk about this set

AI assistant with full set data

BlockTalk

Hi! I'm BlockTalk, your LEGO expert. Ask me anything about the Monorail Transport Base - building tips, investment potential, comparisons, or anything else!

Try asking:

How does the Monorail Transport Base compare to other monorail systems LEGO has released? What are the common issues with the monorail's motor, and how can they be resolved? What is the best way to display the Monorail Transport Base to highlight its features? How does the set's value vary depending on its condition and the presence of the original box?

🧱 Building Experience

AI-assisted build estimate, grounded in our LEGO database and public community discussions. How we use AI

🧩

573

Pieces

⏱

4.5h

Estimated Build Time

📊

Intermediate

Difficulty

Build Highlights:

Assembling the intricate monorail track system
Constructing the multi-level transport base with its futuristic design
Integrating electronic components for the monorail's movement
Enjoying the play features and display options provided by the completed set

📈 Investment Analysis

AI-assisted investment analysis, grounded in our LEGO database and public community discussions. How we use AI

→ Price stable

B+

Investment Grade

⏳ Retired

The Monorail Transport Base (6991-1) represents a solid investment opportunity within the LEGO collecting world. As a retired set from the classic Unitron theme, it benefits from nostalgia and a dedicated fan base. The set's age, coupled with its relatively high piece count and the inclusion of a functioning monorail system, contribute to its desirability. However, the presence and condition of the original box and instructions are crucial factors in determining its value. The electronic components of the monorail also introduce an element of risk, as functionality can degrade over time, affecting the set's overall value. Despite these risks, the stable price trend suggests consistent demand, making it a worthwhile consideration for investors focused on vintage LEGO space sets.

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

⚖ Compare Similar Sets

Blacktron Message Intercept Base

Blacktron II • 481 pcs

$75.00

Compared to modern LEGO train sets, the Monorail Transport Base offers a unique retro appeal and a distinct building experience. While newer sets may have more advanced features and smoother operation, the Monorail Transport Base stands out for its vintage charm and historical significance within the LEGO space theme. For collectors seeking a more contemporary monorail experience, the LEGO City train sets could be an alternative, but the Monorail Transport Base remains a prized piece for those drawn to classic LEGO designs.

4 Minifigures Included

Unitron

2x included

B+

Spyrius Droid / Major Kartofski

The set includes four minifigures: a Spyrius Droid/Major Kartofski and three Unitron figures (two standard and one chief). These vintage space minifigures are highly collectible, adding to the set's appeal.

📦 Parts Inventory

Piece count: 573
Parts cataloged in this inventory: 140 unique parts, 551 pieces
Minifigures: 4

The piece count includes the 22 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.

Missing a piece? Check this set piece by piece, with look-alike colors flagged and element IDs for replacements.

Wing, Tail 4 x 1 x 3

Part #: 2340 4× Light Gray

Brick 2 x 2 Corner

Part #: 2357 2× Light Gray

Panel 1 x 2 x 3 -...

Part #: 2362a 4× Black

Panel 10 x 6 x 11

Part #: 2408 2× Trans-Dark Blue

Tile Special 1 x ...

Part #: 2412b 6× Black

Tile Special 1 x ...

Part #: 2412b 1× Blue

Tile Special 1 x ...

Part #: 2412b 16× Light Gray

Wedge Plate 3 x 6...

Part #: 2419 4× Black

Plate 2 x 2 Corner

Part #: 2420 2× Black

Tile 1 x 4 with G...

Part #: 2431 2× Black

Tile 1 x 4 with G...

Part #: 2431 4× Light Gray

Bracket 1 x 2 - 1...

Part #: 2436 1× Black

Plate Special 2 x...

Part #: 2444 2× Light Gray

Plate Special 2 x...

Part #: 2444 5× Black

Plate 2 x 12

Part #: 2445 2× Light Gray

Hinge Plate 1 x 2...

Part #: 2452 2× Black

Brick 1 x 1 x 5 w...

Part #: 2453a 2× Black

Brick 1 x 16

Part #: 2465 3× Black

Brick 1 x 16

Part #: 2465 6× Light Gray

Panel 3 x 2 x 6

Part #: 2466 7× Trans-Dark Blue

Windscreen 10 x 4...

Part #: 2507 2× Trans-Dark Blue

Wheel Hard Plasti...

Part #: 2515 4× Black

Plate Special 1 x...

Part #: 2540 2× Light Gray

Baseplate Raised ...

Part #: 2552pr0002 1× Black

Tile Special 1 x ...

Part #: 2555 1× Black

Antenna 8H Whip

Part #: 2569 9× Trans-Neon Green

Plate Round 2 x 2...

Part #: 2654 3× Light Gray

Vehicle Track, Mo...

Part #: 2670 5× Light Gray

Vehicle Track, Mo...

Part #: 2671 1× Light Gray

Vehicle Track, Mo...

Part #: 2672 4× Light Gray

Vehicle Track, Mo...

Part #: 2677 2× Light Gray

Vehicle Track, Mo...

Part #: 2678 2× Light Gray

Support 4 x 4 x 5...

Part #: 2680 2× Black

Support 6 x 6 x 1...

Part #: 2681 23× Black

Motor, Monorail 9...

Part #: 2684c01b 1× White

Wheel Holder, Mon...

Part #: 2686c01 2× Black

Vehicle Base, Mon...

Part #: 2687 2× Black

Technic Slope Lon...

Part #: 2744 2× Light Gray

Technic Slope Lon...

Part #: 2744 2× Black

Vehicle Track, Mo...

Part #: 2774 2× Light Gray

Technic Pin with ...

Part #: 2780 2× Black

Vehicle Track, Mo...

Part #: 2881c01 1× Light Gray

Vehicle Track, Mo...

Part #: 2886c01 1× Light Gray

Vehicle Track, Mo...

Part #: 2891 1× Light Gray

Vehicle Track, Mo...

Part #: 2892 1× Light Gray

Hinge Bar 2.5L wi...

Part #: 2923 2× Black

Lever Small Base ...

Part #: 298c02 2× Light Gray

Brick 2 x 4

Part #: 3001 1× Black

Brick 2 x 4

Part #: 3001 2× Light Gray

Brick 2 x 3

Part #: 3002 2× Light Gray

Brick 2 x 3

Part #: 3002 2× Black

Brick 2 x 2

Part #: 3003 2× Black

Brick 2 x 2

Part #: 3003 2× Light Gray

Brick 1 x 2

Part #: 3004 10× Light Gray

Brick 1 x 2

Part #: 3004 3× Black

Brick 2 x 8

Part #: 3007 1× Light Gray

Brick 1 x 8

Part #: 3008 3× Black

Brick 1 x 8

Part #: 3008 4× Light Gray

Brick 1 x 6

Part #: 3009 2× Black

Brick 1 x 4

Part #: 3010 2× Light Gray

Plate 2 x 4

Part #: 3020 1× Light Gray

Plate 2 x 4

Part #: 3020 3× Black

Plate 2 x 2

Part #: 3022 4× Light Gray

Plate 2 x 2

Part #: 3022 10× Black

Plate 2 x 2

Part #: 3022 2× Blue

Plate 1 x 2

Part #: 3023 18× Black

Plate 1 x 2

Part #: 3023 20× Blue

Plate 1 x 2

Part #: 3023 8× Light Gray

Plate 1 x 1

Part #: 3024 2× Black

Plate 6 x 16

Part #: 3027 1× Black

Plate 4 x 10

Part #: 3030 1× Black

Plate 4 x 6

Part #: 3032 1× Light Gray

Plate 4 x 6

Part #: 3032 1× Black

Plate 2 x 8

Part #: 3034 2× Black

Plate 4 x 8

Part #: 3035 3× Black

Brick Sloped 45° ...

Part #: 3039 5× Black

Brick Sloped 45° ...

Part #: 3039 2× Light Gray

Brick Sloped 45° ...

Part #: 3039pr9968 1× Black

Brick Sloped 45° ...

Part #: 3039pr9973 4× Black

Brick Sloped 45° ...

Part #: 3040b 4× Light Gray

Brick Sloped 45° ...

Part #: 3040b 2× Black

Tile 2 x 2 with G...

Part #: 3068b 3× Black

Tile 2 x 2 with Y...

Part #: 3068bpr0021 2× Black

Tile 1 x 2 with D...

Part #: 3069bpr0025 1× White

Tile 1 x 2 with A...

Part #: 3069bpr0038 2× Black

Tile 1 x 2 with A...

Part #: 3069bpr9981 3× Black

Plate Special 3 x...

Part #: 3176 1× Light Gray

Brick Sloped 33° ...

Part #: 3297 2× Light Gray

Brick Sloped 33° ...

Part #: 3298 2× Black

Brick Sloped 33° ...

Part #: 3298 3× Light Gray

Brick Sloped 33° ...

Part #: 3300 3× Blue

Turntable 4 x 4 S...

Part #: 3403c01 2× Black

Plate 1 x 8

Part #: 3460 4× Blue

Plate 1 x 8

Part #: 3460 4× Black

Engine - Smooth, ...

Part #: 3475b 6× Blue

Tail 4 x 2 x 2

Part #: 3479 2× Light Gray

Wheel with Split ...

Part #: 3482 1× Black

Plate 1 x 3

Part #: 3623 6× Black

Plate 1 x 3

Part #: 3623 4× Blue

Tyre 43 x 17

Part #: 3634 1× Black

Brick Sloped Inve...

Part #: 3660 1× Light Gray

Plate 1 x 6

Part #: 3666 4× Black

Technic Pin witho...

Part #: 3673 4× Light Gray

Plate 1 x 4

Part #: 3710 38× Black

Plate 1 x 4

Part #: 3710 3× Light Gray

Technic Bush

Part #: 3713 3× Light Gray

Technic Axle 10

Part #: 3737 2× Black

Technic Plate 2 x...

Part #: 3738 2× Black

Brick Sloped Inve...

Part #: 3747a 1× Black

Plate Special 1 x...

Part #: 3794a 1× Black

Plate Special 1 x...

Part #: 3794a 6× Light Gray

Plate 2 x 6

Part #: 3795 2× Black

Steering Stand 1 ...

Part #: 3829c01 1× Light Gray

Plate 2 x 10

Part #: 3832 1× Light Gray

Plate Special 1 x...

Part #: 3839b 1× Black

Plate Special 1 x...

Part #: 3839b 1× Blue

Baseplate 16 x 32

Part #: 3857 2× Black

Support Round 2 x...

Part #: 3940b 4× Black

Brick Round 2 x 2...

Part #: 3941 2× Black

Cone 2 x 2 x 2, O...

Part #: 3942c 2× Light Gray

Cone 4 x 4 x 2, A...

Part #: 3943b 1× Black

Bracket 2 x 2 - 2...

Part #: 3956 2× Black

Weapon Gun / Torc...

Part #: 3959 2× Black

Weapon Gun / Torc...

Part #: 3959 2× Light Gray

Dish 4 x 4 Invert...

Part #: 3960 4× Trans-Dark Blue

Brick Special 1 x...

Part #: 3963 2× Black

Brick Special 1 x...

Part #: 3963 2× Blue

Plate Round 2 x 2...

Part #: 4032a 7× Light Gray

Plate Round 2 x 2...

Part #: 4032a 2× Blue

Brick Special 1 x...

Part #: 4070 4× Black

Plate Special 1 x...

Part #: 4081b 2× Light Gray

Plate Special 1 x...

Part #: 4081b 2× Black

Plate Special 1 x...

Part #: 4085c 1× Black

Tile Round 2 x 2 ...

Part #: 4150 1× Black

Plate Special 8 x...

Part #: 4151a 4× Black

Tile 1 x 8 with G...

Part #: 4162 4× Blue

Tile 1 x 8 with G...

Part #: 4162 4× Black

Tile 1 x 8 with G...

Part #: 4162 6× Light Gray

Engine, Strakes, ...

Part #: 4229 1× Black

Technic Bush 1/2 ...

Part #: 4265b 1× Light Gray

Hinge Plate 1 x 2...

Part #: 4275b 2× Blue

Hinge Plate 1 x 2...

Part #: 4276b 2× Black

Plate 2 x 16

Part #: 4282 2× Black

Dish 6 x 6 Invert...

Part #: 4285a 1× Black

Brick Sloped 33° ...

Part #: 4286 1× Light Gray

Hinge Vehicle Roo...

Part #: 4315 2× Black

Support 2 x 4 x 5...

Part #: 4476b 6× Light Gray

Plate 1 x 10

Part #: 4477 3× Black

Cone 1 x 1 [No To...

Part #: 4589 2× Trans-Neon Green

Plate Special 1 x...

Part #: 4590 3× Black

Plate Special 1 x...

Part #: 4596 2× Light Gray

Brick Special 2 x...

Part #: 4730 1× Light Gray

Brick Special 1 x...

Part #: 4733 2× Light Gray

Dish 2 x 2 Invert...

Part #: 4740 3× Trans-Dark Blue

Dish 2 x 2 Invert...

Part #: 4740 5× Trans-Neon Green

Battery Box, 9V S...

Part #: 4760c01 1× Black

Light Brick 1 x 4...

Part #: 4771 1× Black

Wedge Plate 3 x 4...

Part #: 4859 1× Black

Wire with Brick 2...

Part #: 5306bc015 1× Black

Plate Special 1 x...

Part #: 6019 3× Black

Plate Special 1 x...

Part #: 6019 4× Blue

Brick 2 x 4 x 2 w...

Part #: 6061 1× Black

Rock Panel Rectan...

Part #: 6082 1× Dark Gray

Rock Panel Triang...

Part #: 6083 1× Dark Gray

Bracket 5 x 2 x 2...

Part #: 6087 1× Black

Wedge Plate 8 x 8...

Part #: 6104 2× Black

Brick 1 x 10

Part #: 6111 2× Black

Brick 1 x 10

Part #: 6111 2× Light Gray

Plate Round 1 x 1...

Part #: 6141 8× Trans-Neon Green

Brick Wedged, Slo...

Part #: 6153a 2× Light Gray

Technic Brick 1 x...

Part #: 6541 2× Black

Flexible Hose 8.5...

Part #: 73590c01a 2× Light Gray

Technic Universal...

Part #: 9244 1× Light Gray

🧱 Sticker Sheet for...

Part #: 168285 1× [No Color/Any Color]

This set is a great source for black and light gray plates and bricks, useful for MOC builders looking to create space-themed models. The trans-neon green elements also add a unique touch and are desirable for their rarity.

🛒 Where to Buy

eBay

Search listings

→

💎 Notable Parts

Black Plate 1 x 4 (38x) $1.90

Trans-Neon Green Antenna 8H Whip (9x) $2.70

Light Gray Brick 1 x 16 (6x) $1.80

Black Support 6 x 6 x 10 Stanchion (23x) $11.50

Trans-Dark Blue Panel 3 x 2 x 6 (7x) $7.00

Est. BrickLink Part Value

$24.90

💡 MOC Potential

🏙 Expand the monorail system to create a larger futuristic city layout.

🚀 Design a new space station or research facility using the set's parts.

🚗 Build a ground-based transport vehicle to complement the monorail.

Community Insights

Real opinions from Reddit and YouTube

What Reddit Says

No Reddit discussions found for this set.

What YouTubers Say

Based on 7 videos

3.0 /5

Mixed

0% positive

BlockTalk AI

LEGO Monorail Transport Base (6991-1) receives generally neutral coverage from LEGO YouTubers, recognized as a classic set from the Futuron and Unitron space themes. Reviewers like BrickTsar and BrickVault showcase the set's vintage appeal and unique design elements.

LEGO Space 6990 Futuron Monorail Transport System Train from 1987

BrickTsar • 77.0K views Review

ЛЕГО 6991 Поезд Монорельс Обзор / LEGO 6991 Monorail Train Review

Desert Eagle LEGO® Technic Creations • 60.0K views Review

Space LEGO Unitron 6991 Monorail Transport Base Train from 1994 Vintage set

BrickTsar • 54.2K views Review

Community Sentiment

Based on 7 YouTube reviews

Not enough Reddit data

YouTube

3.0 /5

Mixed

0% positive

Positive

Mixed

Critical

BlockTalk AI Analysis

What the Community Says

6 YouTube reviews

BlockTalk AI Summary

BrickTsar highlights both the 6990 and 6991 versions, emphasizing their historical significance within the LEGO Space line. Desert Eagle LEGO® Technic Creations provides a review of the 6991 Monorail Train, appealing to Russian-speaking audiences.