Monorail Transport Base (6991-1) is a Unitron LEGO set released in 1994 with 573 pieces. Browse the parts list, minifigures, and verify loose bricks with our free scanner. Collectors browsing Unitron sets use this inventory to verify loose parts, compare color variants, and read official build manuals without downloading PDFs. This set includes 4 minifigures and 174 unique part types.
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Buying checklist
Quick context before you buy this set used or verify a marketplace listing.
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Release year
1994 (32 years ago — may be retired)
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Catalog scale
573 parts listed · 174 inventory lines tracked
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Minifigures
4 in this set's inventory — verify completeness when buying used
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Build manual
No digital manual in our catalog — check the box tab or LEGO.com
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Build complexity
Large set — expect sticker sheets or multiple subassemblies; inspect photos closely
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Gray era
Pre-2004 set — may use old light/dark gray instead of bluish gray
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Shipping weight (est.)
~849 g for parts inventory (excludes box/minifig packaging)
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Before you buy used
Run the completion checker, compare photos to the inventory, and check live listings for sealed pricing
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Market value
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Minifigures in Monorail Transport Base
Parts in this set
174 parts · page 1 of 4 · updating…
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Antenna 8H Whip2569 · ×9 · Trans-Neon Green -
Baseplate 16 x 323857 · ×2 · Black -
Baseplate Raised 32 x 32 with Ramp and Pit, Crater Print2552pr0002 · ×1 · Black -
![Battery Box, 9V Small [Complete Assembly]](https://cdn.rebrickable.com/media/parts/ldraw/0/4760c01.png)
Battery Box, 9V Small [Complete Assembly]4760c01 · ×1 · Black -
![Bracket 1 x 2 - 1 x 4 [Square Corners]](https://cdn.rebrickable.com/media/parts/elements/243626.jpg)
Bracket 1 x 2 - 1 x 4 [Square Corners]2436 · ×1 · Black -
Bracket 2 x 2 - 2 x 23956 · ×2 · Black -
Bracket 5 x 2 x 2 1/3 with Holes, Smooth Bottom6087 · ×1 · Black -
Brick 1 x 1 x 5 with Blocked Open or Hollow Stud2453a · ×2 · Black -
Brick 1 x 106111 · ×2 · Light Gray -
Brick 1 x 106111 · ×2 · Black -
Brick 1 x 162465 · ×3 · Black -
Brick 1 x 162465 · ×6 · Light Gray -
Brick 1 x 23004 · ×3 · Black -
Brick 1 x 23004 · ×10 · Light Gray -
Brick 1 x 43010 · ×2 · Light Gray -
Brick 1 x 63009 · ×2 · Black -
Brick 1 x 83008 · ×4 · Light Gray -
Brick 1 x 83008 · ×3 · Black -
Brick 2 x 23003 · ×2 · Light Gray -
Brick 2 x 23003 · ×2 · Black -
Brick 2 x 2 Corner2357 · ×2 · Light Gray -
Brick 2 x 33002 · ×2 · Black -
Brick 2 x 33002 · ×2 · Light Gray -
Brick 2 x 43001 · ×1 · Black -
Brick 2 x 43001 · ×2 · Light Gray -
Brick 2 x 4 x 2 with Holes on Sides6061 · ×1 · Black -
Brick 2 x 83007 · ×1 · Light Gray -
Brick Round 2 x 2 with Axle Hole3941 · ×2 · Black -
Brick Sloped 33° 2 x 2 Double3300 · ×3 · Blue -
Brick Sloped 33° 3 x 14286 · ×1 · Light Gray -
Brick Sloped 33° 3 x 23298 · ×3 · Light Gray -
Brick Sloped 33° 3 x 23298 · ×2 · Black -
Brick Sloped 33° 3 x 43297 · ×2 · Light Gray -
Brick Sloped 45° 2 x 1 with Bottom Pin3040b · ×2 · Black -
Brick Sloped 45° 2 x 1 with Bottom Pin3040b · ×4 · Light Gray -
Brick Sloped 45° 2 x 23039 · ×2 · Light Gray -
Brick Sloped 45° 2 x 23039 · ×5 · Black -
Brick Sloped 45° 2 x 2 with Horizon Screen Print3039pr9973 · ×4 · Black -
Brick Sloped 45° 2 x 2 with Spyrius Droid Image Print3039pr9968 · ×1 · Black -
Brick Sloped Inverted 33° 3 x 2, No Connections between Studs, Ovoid Bottom Pin3747a · ×1 · Black -
![Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes]](https://cdn.rebrickable.com/media/parts/elements/366002.jpg)
Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes]3660 · ×1 · Light Gray -
Brick Special 1 x 1 Studs on 4 Sides4733 · ×2 · Light Gray -
Brick Special 1 x 1 with 3 Speakers / Loudspeakers / Space Positioning Rockets3963 · ×2 · Black -
Brick Special 1 x 1 with 3 Speakers / Loudspeakers / Space Positioning Rockets3963 · ×2 · Blue -
Brick Special 1 x 1 with Headlight4070 · ×4 · Black -
Brick Special 2 x 2 with Pin and No Axle Hole4730 · ×1 · Light Gray -
Brick Wedged, Sloped 6 x 4 Cutout, No Stud Notches6153a · ×2 · Light Gray -
![Cone 1 x 1 [No Top Groove]](https://cdn.rebrickable.com/media/parts/elements/618849.jpg)
Cone 1 x 1 [No Top Groove]4589 · ×2 · Trans-Neon Green