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Monorail Transport Base

Monorail Transport Base

6991-1·Space·1994·3 minifigs·175 parts

Used Avg
$674.36
New Avg
$3730.04
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About Monorail Transport Base

Monorail Transport Base (6991-1) is a LEGO Space set released in 1994, currently averaging $674.36 used on BrickLink. It comes with 3 minifigures worth a combined $34.18. The set has retired from retail, so secondary market is the only option. The full parts inventory runs 175 pieces.

Part-out value

The minifigures make up only 5% of this set's value ($34.18 out of $674.36). The bulk of the value is in the parts or the set being complete. Sell it as a complete set if possible.

Seller notes

  • Sealed copies sell for $3730.04 vs $674.36 used — a 453% premium. If you have this set new in sealed box (NISB), price it accordingly.
  • This is a vintage set (1994). Condition of the box and instructions significantly affects value. A complete set with original box and instructions can sell for well above the average.

Minifigures in Monorail Transport Base (3)

Spyrius Droid (Major Kartofski)
Spyrius Droid (Major Kartofski)
sp041$6.32
Unitron
Unitron
sp048×2$9.41
Unitron Chief
Unitron Chief
sp049$9.03

Parts (175)

Tail 4 x 1 x 3
Tail 4 x 1 x 3
Light Gray×4
Brick 2 x 2 Corner
Brick 2 x 2 Corner
Light Gray×2
Panel 1 x 2 x 3 - Solid Studs
Panel 1 x 2 x 3 - Solid Studs
Black×4
Panel 10 x 6 x 11
Panel 10 x 6 x 11
Trans-Dark Blue×2
Tile, Modified 1 x 2 Grille with Bottom Groove
Tile, Modified 1 x 2 Grille with Bottom Groove
Blue
Tile, Modified 1 x 2 Grille with Bottom Groove
Tile, Modified 1 x 2 Grille with Bottom Groove
Light Gray×16
Tile, Modified 1 x 2 Grille with Bottom Groove
Tile, Modified 1 x 2 Grille with Bottom Groove
Black×6
Wedge, Plate 3 x 6 Cut Corners
Wedge, Plate 3 x 6 Cut Corners
Black×4
Plate 2 x 2 Corner
Plate 2 x 2 Corner
Black×2
Tile 1 x 4
Tile 1 x 4
Light Gray×4
Tile 1 x 4
Tile 1 x 4
Black×2
Bracket 1 x 2 - 1 x 4
Bracket 1 x 2 - 1 x 4
Black
Plate, Modified 2 x 2 with Pin Hole
Plate, Modified 2 x 2 with Pin Hole
Light Gray×2
Plate, Modified 2 x 2 with Pin Hole
Plate, Modified 2 x 2 with Pin Hole
Black×5
Plate 2 x 12
Plate 2 x 12
Light Gray×2
Hinge Plate 1 x 2 with 3 Fingers on Side
Hinge Plate 1 x 2 with 3 Fingers on Side
Black×2
Brick 1 x 1 x 5 - Hollow Stud
Brick 1 x 1 x 5 - Hollow Stud
Black×2
Brick 1 x 16
Brick 1 x 16
Light Gray×6
Brick 1 x 16
Brick 1 x 16
Black×3
Panel 3 x 2 x 6
Panel 3 x 2 x 6
Trans-Dark Blue×7
Windscreen 10 x 4 x 2 1/3 Canopy
Windscreen 10 x 4 x 2 1/3 Canopy
Trans-Dark Blue×2
Wheel Hard Plastic Large (54mm D. x 30mm)
Wheel Hard Plastic Large (54mm D. x 30mm)
Black×4
Plate, Modified 1 x 2 with Bar Handle on Side - Free Ends
Plate, Modified 1 x 2 with Bar Handle on Side - Free Ends
Light Gray×2
Baseplate, Raised 32 x 32 with Ramp and Pit with Craters Pattern
Baseplate, Raised 32 x 32 with Ramp and Pit with Craters Pattern
Black
Tile, Modified 1 x 1 with Clip
Tile, Modified 1 x 1 with Clip
Black
Antenna Whip 8H
Antenna Whip 8H
Trans-Neon Green×9
Plate, Round 2 x 2 with Rounded Bottom (Boat Stud)
Plate, Round 2 x 2 with Rounded Bottom (Boat Stud)
Light Gray×3
Monorail Track Straight Short
Monorail Track Straight Short
Light Gray×5
Monorail Track Straight Long
Monorail Track Straight Long
Light Gray
Monorail Track Curve Long
Monorail Track Curve Long
Light Gray×4
Monorail Track Ramp Lower Part
Monorail Track Ramp Lower Part
Light Gray×2
Monorail Track Ramp Upper Part
Monorail Track Ramp Upper Part
Light Gray×2
Support 4 x 4 x 5 Stanchion
Support 4 x 4 x 5 Stanchion
Black×2
Support 6 x 6 x 10 Stanchion
Support 6 x 6 x 10 Stanchion
Black×23
Monorail Motor 9V with Long Couplings
Monorail Motor 9V with Long Couplings
White
Monorail Bogey with Bogey Bracket/Pivot
Monorail Bogey with Bogey Bracket/Pivot
Black×2
Monorail Base 4 x 20
Monorail Base 4 x 20
Black×2
Technic Slope 6 x 1 x 1 2/3
Technic Slope 6 x 1 x 1 2/3
Light Gray×2
Technic Slope 6 x 1 x 1 2/3
Technic Slope 6 x 1 x 1 2/3
Black×2
Monorail Track Monoswitch (2772c02 / 2774)
Monorail Track Monoswitch (2772c02 / 2774)
Light Gray×2
Technic, Pin with Short Friction Ridges
Technic, Pin with Short Friction Ridges
Black×2
Monorail Track Point Right
Monorail Track Point Right
Light Gray
Monorail Track Point Left
Monorail Track Point Left
Light Gray
Monorail Track Curve Short Right
Monorail Track Curve Short Right
Light Gray
Monorail Track Curve Short Left
Monorail Track Curve Short Left
Light Gray
Hinge Bar 2.5L with 2 and 3 Fingers on Ends (Pantograph Shoe Holder)
Hinge Bar 2.5L with 2 and 3 Fingers on Ends (Pantograph Shoe Holder)
Black×2
Brick 2 x 4
Brick 2 x 4
Light Gray×2
Brick 2 x 4
Brick 2 x 4
Black
Brick 2 x 3
Brick 2 x 3
Light Gray×2
Brick 2 x 3
Brick 2 x 3
Black×2
Brick 2 x 2
Brick 2 x 2
Light Gray×2
Brick 2 x 2
Brick 2 x 2
Black×2
Brick 1 x 2
Brick 1 x 2
Light Gray×10
Brick 1 x 2
Brick 1 x 2
Black×3
Brick 2 x 8
Brick 2 x 8
Light Gray
Brick 1 x 8
Brick 1 x 8
Light Gray×4
Brick 1 x 8
Brick 1 x 8
Black×3
Brick 1 x 6
Brick 1 x 6
Black×2
Brick 1 x 4
Brick 1 x 4
Light Gray×2
Plate 2 x 4
Plate 2 x 4
Light Gray
Plate 2 x 4
Plate 2 x 4
Black×3
Plate 2 x 2
Plate 2 x 2
Blue×2
Plate 2 x 2
Plate 2 x 2
Light Gray×4
Plate 2 x 2
Plate 2 x 2
Black×10
Plate 1 x 2
Plate 1 x 2
Blue×20
Plate 1 x 2
Plate 1 x 2
Light Gray×8
Plate 1 x 2
Plate 1 x 2
Black×18
Plate 1 x 1
Plate 1 x 1
Black×2
Plate 6 x 16
Plate 6 x 16
Black
Plate 4 x 10
Plate 4 x 10
Black
Plate 4 x 6
Plate 4 x 6
Light Gray
Plate 4 x 6
Plate 4 x 6
Black
Plate 2 x 8
Plate 2 x 8
Black×2
Plate 4 x 8
Plate 4 x 8
Black×3
Slope 45 2 x 2
Slope 45 2 x 2
Light Gray×2
Slope 45 2 x 2
Slope 45 2 x 2
Black×5
Slope 45 2 x 2 with Spyrius Droid Image Pattern
Slope 45 2 x 2 with Spyrius Droid Image Pattern
Black
Slope 45 2 x 2 with Horizon Screen Pattern
Slope 45 2 x 2 with Horizon Screen Pattern
Black×4
Slope 45 2 x 1
Slope 45 2 x 1
Light Gray×4
Slope 45 2 x 1
Slope 45 2 x 1
Black×2
Tile 2 x 2
Tile 2 x 2
Black×3
Tile 2 x 2 with Thin Yellow Arrow without Black Border Pattern
Tile 2 x 2 with Thin Yellow Arrow without Black Border Pattern
Black×2
Tile 1 x 2 with Yellow Arrow Short without Black Border Pattern
Tile 1 x 2 with Yellow Arrow Short without Black Border Pattern
Black×2
Tile 1 x 2 with Yellow Arrow Long without Black Border Pattern
Tile 1 x 2 with Yellow Arrow Long without Black Border Pattern
Black×3
Tile 1 x 2 with Digital Clock with '12:01' / '10:21' on Black Background Pattern
Tile 1 x 2 with Digital Clock with '12:01' / '10:21' on Black Background Pattern
White
Plate, Modified 2 x 3 with Hole
Plate, Modified 2 x 3 with Hole
Light Gray
Slope 33 3 x 4
Slope 33 3 x 4
Light Gray×2
Slope 33 3 x 2
Slope 33 3 x 2
Light Gray×3
Slope 33 3 x 2
Slope 33 3 x 2
Black×2
Slope 33 2 x 2 Double
Slope 33 2 x 2 Double
Blue×3
Turntable 4 x 4 Square Base with (Same Color) Top (3403 / 3404)
Turntable 4 x 4 Square Base with (Same Color) Top (3403 / 3404)
Black×2
Plate 1 x 8
Plate 1 x 8
Blue×4
Plate 1 x 8
Plate 1 x 8
Black×4
Engine, Smooth Small, 1 x 2 Side Plate with Axle Holders
Engine, Smooth Small, 1 x 2 Side Plate with Axle Holders
Blue×6
Tail 4 x 2 x 2
Tail 4 x 2 x 2
Light Gray×2
Wheel with Split Axle Hole
Wheel with Split Axle Hole
Black
Plate 1 x 3
Plate 1 x 3
Blue×4
Plate 1 x 3
Plate 1 x 3
Black×6
Tire 17 x 43
Tire 17 x 43
Black
Slope, Inverted 45 2 x 2 with Flat Bottom Pin
Slope, Inverted 45 2 x 2 with Flat Bottom Pin
Light Gray
Plate 1 x 6
Plate 1 x 6
Black×4
Technic, Pin without Friction Ridges
Technic, Pin without Friction Ridges
Light Gray×4
Plate 1 x 4
Plate 1 x 4
Light Gray×3
Plate 1 x 4
Plate 1 x 4
Black×38
Technic Bush
Technic Bush
Light Gray×3
Technic, Axle 10L
Technic, Axle 10L
Black×2
Technic, Plate 2 x 8 with 7 Holes
Technic, Plate 2 x 8 with 7 Holes
Black×2
Slope, Inverted 33 3 x 2 with Flat Bottom Pin without Connections between Studs
Slope, Inverted 33 3 x 2 with Flat Bottom Pin without Connections between Studs
Black
Plate, Modified 1 x 2 with 1 Stud without Groove (Jumper)
Plate, Modified 1 x 2 with 1 Stud without Groove (Jumper)
Light Gray×6
Plate, Modified 1 x 2 with 1 Stud without Groove (Jumper)
Plate, Modified 1 x 2 with 1 Stud without Groove (Jumper)
Black
Plate 2 x 6
Plate 2 x 6
Black×2
Vehicle, Steering Stand 1 x 2 with Black Steering Wheel
Vehicle, Steering Stand 1 x 2 with Black Steering Wheel
Light Gray
Plate 2 x 10
Plate 2 x 10
Light Gray
Plate, Modified 1 x 2 with Bar Handles - Flat Ends, Low Attachment
Plate, Modified 1 x 2 with Bar Handles - Flat Ends, Low Attachment
Blue
Plate, Modified 1 x 2 with Bar Handles - Flat Ends, Low Attachment
Plate, Modified 1 x 2 with Bar Handles - Flat Ends, Low Attachment
Black
Baseplate 16 x 32
Baseplate 16 x 32
Black×2
Support 2 x 2 x 2 Stand with Complete Hole
Support 2 x 2 x 2 Stand with Complete Hole
Black×4
Brick, Round 2 x 2 with Axle Hole
Brick, Round 2 x 2 with Axle Hole
Black×2
Cone 2 x 2 x 2 - Open Stud
Cone 2 x 2 x 2 - Open Stud
Light Gray×2
Cone 4 x 4 x 2 with Axle Hole
Cone 4 x 4 x 2 with Axle Hole
Black
Bracket 2 x 2 - 2 x 2 with 2 Holes
Bracket 2 x 2 - 2 x 2 with 2 Holes
Black×2
Minifigure, Utensil Space Gun / Torch
Minifigure, Utensil Space Gun / Torch
Light Gray×2
Minifigure, Utensil Space Gun / Torch
Minifigure, Utensil Space Gun / Torch
Black×2
Dish 4 x 4 Inverted (Radar) with Solid Stud
Dish 4 x 4 Inverted (Radar) with Solid Stud
Trans-Dark Blue×4
Brick, Modified 1 x 1 with 3 Loudspeakers / Space Positioning Rockets
Brick, Modified 1 x 1 with 3 Loudspeakers / Space Positioning Rockets
Blue×2
Brick, Modified 1 x 1 with 3 Loudspeakers / Space Positioning Rockets
Brick, Modified 1 x 1 with 3 Loudspeakers / Space Positioning Rockets
Black×2
Plate, Round 2 x 2 with Axle Hole
Plate, Round 2 x 2 with Axle Hole
Blue×2
Plate, Round 2 x 2 with Axle Hole
Plate, Round 2 x 2 with Axle Hole
Light Gray×7
Brick, Modified 1 x 1 with Headlight
Brick, Modified 1 x 1 with Headlight
Black×4
Plate, Round 1 x 1
Plate, Round 1 x 1
Trans-Neon Green×9
Plate, Modified 1 x 1 with Light Attachment - Thick Ring
Plate, Modified 1 x 1 with Light Attachment - Thick Ring
Light Gray×2
Plate, Modified 1 x 1 with Light Attachment - Thick Ring
Plate, Modified 1 x 1 with Light Attachment - Thick Ring
Black×2
Plate, Modified 1 x 1 with U Clip Thick (Vertical Grip)
Plate, Modified 1 x 1 with U Clip Thick (Vertical Grip)
Black
Tile, Round 2 x 2
Tile, Round 2 x 2
Black
Plate, Modified 8 x 8 Lattice without Hole in Center
Plate, Modified 8 x 8 Lattice without Hole in Center
Black×4
Tile 1 x 8
Tile 1 x 8
Blue×4
Tile 1 x 8
Tile 1 x 8
Light Gray×6
Tile 1 x 8
Tile 1 x 8
Black×4
Engine, Strakes, 2 x 2 Thin Top Plate
Engine, Strakes, 2 x 2 Thin Top Plate
Black
Technic Bush 1/2 Toothed with 2 Interior Ridges
Technic Bush 1/2 Toothed with 2 Interior Ridges
Light Gray×2
Hinge Plate 1 x 2 with 3 Fingers on End - Hollow Studs
Hinge Plate 1 x 2 with 3 Fingers on End - Hollow Studs
Blue×4
Hinge Plate 1 x 2 with 2 Fingers on End - Hollow Studs
Hinge Plate 1 x 2 with 2 Fingers on End - Hollow Studs
Black×2
Plate 2 x 16
Plate 2 x 16
Black×2
Dish 6 x 6 Inverted (Radar) Webbed - Type 1 (underside attachable at any position)
Dish 6 x 6 Inverted (Radar) Webbed - Type 1 (underside attachable at any position)
Black
Slope 33 3 x 1
Slope 33 3 x 1
Light Gray
Hinge Plate 1 x 4
Hinge Plate 1 x 4
Black×2
Support 2 x 4 x 5 Stanchion Inclined, 5mm Wide Posts
Support 2 x 4 x 5 Stanchion Inclined, 5mm Wide Posts
Light Gray×6
Plate 1 x 10
Plate 1 x 10
Black×3
Hinge Plate 1 x 6 with 2 and 3 Fingers On Ends
Hinge Plate 1 x 6 with 2 and 3 Fingers On Ends
Blue×2
Cone 1 x 1
Cone 1 x 1
Trans-Neon Green×2
Plate, Modified 1 x 4 Offset
Plate, Modified 1 x 4 Offset
Black×3
Antenna Small Base with Black Lever (4592 / 4593)
Antenna Small Base with Black Lever (4592 / 4593)
Light Gray×2
Plate, Modified 1 x 2 with Long Stud Holder (Space Wing)
Plate, Modified 1 x 2 with Long Stud Holder (Space Wing)
Light Gray×2
Brick, Modified 2 x 2 with Pin and No Axle Hole
Brick, Modified 2 x 2 with Pin and No Axle Hole
Light Gray
Brick, Modified 1 x 1 with Studs on 4 Sides
Brick, Modified 1 x 1 with Studs on 4 Sides
Light Gray×2
Dish 2 x 2 Inverted (Radar)
Dish 2 x 2 Inverted (Radar)
Trans-Dark Blue×3
Dish 2 x 2 Inverted (Radar)
Dish 2 x 2 Inverted (Radar)
Trans-Neon Green×5
Electric 9V Battery Box Small Assembly
Electric 9V Battery Box Small Assembly
Black
Electric, Light Brick 1 x 4 with 2 Lamps on Top
Electric, Light Brick 1 x 4 with 2 Lamps on Top
Black
Wedge, Plate 3 x 4 without Stud Notches
Wedge, Plate 3 x 4 without Stud Notches
Black
Electric, Wire with Brick 2 x 2 x 2/3 Ends 15L
Electric, Wire with Brick 2 x 2 x 2/3 Ends 15L
Black
Plate, Modified 1 x 1 with U Clip (Horizontal Grip)
Plate, Modified 1 x 1 with U Clip (Horizontal Grip)
Blue×4
Plate, Modified 1 x 1 with U Clip (Horizontal Grip)
Plate, Modified 1 x 1 with U Clip (Horizontal Grip)
Black×3
Brick, Modified 2 x 4 x 2 with Holes on Sides
Brick, Modified 2 x 4 x 2 with Holes on Sides
Black
Rock Panel 4 x 10 x 6 Rectangular (BURP)
Rock Panel 4 x 10 x 6 Rectangular (BURP)
Dark Gray
Rock Panel 3 x 8 x 7 Triangular (LURP)
Rock Panel 3 x 8 x 7 Triangular (LURP)
Dark Gray
Bracket 5 x 2 x 2 1/3 with 2 Holes
Bracket 5 x 2 x 2 1/3 with 2 Holes
Black
Wedge, Plate 8 x 8 with 3 x 4 Cutout
Wedge, Plate 8 x 8 with 3 x 4 Cutout
Black×2
Brick 1 x 10
Brick 1 x 10
Light Gray×2
Brick 1 x 10
Brick 1 x 10
Black×2
Wedge 6 x 4 Cutout without Stud Notches
Wedge 6 x 4 Cutout without Stud Notches
Light Gray×2
Technic, Brick 1 x 1 with Hole
Technic, Brick 1 x 1 with Hole
Black×2
Sticker Sheet for Set 6991 - (168285)
Sticker Sheet for Set 6991 - (168285)
(Not Applicable)
Hose, Flexible 8.5L with (Same Color) Tabless Ends
Hose, Flexible 8.5L with (Same Color) Tabless Ends
Light Gray×2
Technic, Universal Joint 4L
Technic, Universal Joint 4L
Light Gray

Common questions about Monorail Transport Base

How much is LEGO Monorail Transport Base (6991-1) worth?

Monorail Transport Base sells for an average of $674.36 used and $3730.04 new/sealed on BrickLink based on 6 months of completed sales. As a retired set, prices tend to hold steady or appreciate over time, especially for complete sets with original packaging. Actual prices vary with completeness — missing minifigures or key parts will lower the value.

What minifigures come in LEGO set 6991-1?

This set includes 3 minifigures: Spyrius Droid (Major Kartofski) ($6.32), Unitron ($9.41), Unitron Chief ($9.03). The minifigures have a combined BrickLink value of $34.18. Each figure is linked above with individual pricing if you're looking to buy or sell specific characters.

Is it worth parting out LEGO Monorail Transport Base?

The minifigures make up about 5% of the set value ($34.18 out of $674.36). Most of the value is in the complete set package, so selling it whole is likely the better move unless you have buyers lined up for specific figures.

Is LEGO Monorail Transport Base (6991-1) retired?

Yes, Monorail Transport Base was released in 1994 and has been retired from retail for several years. Retired LEGO sets are only available on the secondary market through BrickLink, eBay, or other resale platforms. At its current price point, it has appreciated since retirement.

How do I check if my Monorail Transport Base set is complete?

Use the parts list on this page to check every piece and all 3 minifigures. For the minifigures specifically, you can use the brick'em scanner to identify each figure from a photo and confirm it matches what should be in this set. Missing pieces can be individually sourced on BrickLink.

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