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Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece and leave with the element ID LEGO asks for, or a link to buy the part.

Monorail Transport System

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6990 Monorail Transport System

701 pieces in 162 part and color combinations, plus 5 minifigures.

The official piece count includes the 30 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.

Before you call it missing

Builders who report a missing piece often find it in one of these places. Tick each one off as you look.

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Piece checklist

White 399 pieces

  • Antenna 1 x 4 with Rounded Top White Part 3957a ×2
  • Battery Box, 9V Small [Complete Assembly] with '9V' Print White Part 4760c01pr0001 ×1
  • Bracket 1 x 2 - 1 x 4 [Square Corners] White Part 2436 Element 4282737 or 4159314 ×2
  • Bracket 2 x 2 - 2 x 2 White Part 3956 Element 6313593 or 395601 ×6
  • Bracket 3 x 2 - 2 x 2 [aka Space Seat] White Part 4598 Element 6101992 or 6024078 ×1
  • Brick 1 x 1 White Part 3005 Element 6552096 or 6548258 ×4
  • Brick 1 x 2 White Part 3004 Element 6548257 or 4613964 ×23
  • Brick 1 x 2 with Black Grill Print White Part 3004pr9981 ×2
  • Brick 1 x 4 White Part 3010 Element 6550135 or 301001 ×5
  • Brick 1 x 6 White Part 3009 Element 6552097 or 6548259 ×4
  • Brick 1 x 8 White Part 3008 Element 6550134 or 300801 ×4
  • Brick 2 x 2 White Part 3003 Element 6552095 or 6548256 ×4
  • Brick 2 x 2 Corner White Part 2357 Element 6552088 or 6548253 ×4
  • Brick Round 2 x 2 with Axle Hole White Part 3941 Element 6601920 or 614351 ×3
  • Brick Sloped 45° 2 x 1 with Bottom pin, with 9 Large + 3 Small Black Buttons Print White Part 3040bpr0010 Element 4161160 or 4121973 ×2
  • Brick Sloped 45° 2 x 2 White Part 3039 Element 6552103 or 303901 ×4
  • Brick Sloped 45° 2 x 2 with 12 Buttons, 3 Red Lamps, Black Panel Print White Part 3039pr9996 ×2
  • Brick Sloped 45° 2 x 4 White Part 3037 Element 6552102 or 303701 ×2
  • Brick Sloped 75° 2 x 1 x 3 with Open Stud White Part 4460a ×4
  • Brick Sloped 75° 2 x 2 x 3 [Hollow Studs] White Part 3684 Element 4248055 or 4143976 ×2
  • Brick Sloped Inverted 45° 2 x 1 White Part 3665 Element 6552106 or 366501 ×4
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] White Part 3660 Element 366001 ×2
  • Brick Sloped Inverted 45° 4 x 2 Double with 2 x 2 Recessed White Part 4871 Element 4173943 or 487101 ×2
  • Brick Sloped Inverted 75° 2 x 1 x 3 White Part 2449 Element 6619279 or 4532972 ×4
  • Brick Special 1 x 1 with Headlight White Part 4070 Element 6548267 or 407001 ×2
  • Cone 1 x 1 [No Top Groove] White Part 4589 Element 458901 ×4
  • Dish 2 x 2 Inverted [Radar] White Part 4740 Element 6601845 or 474001 ×16
  • Dish 4 x 4 Inverted [Radar] White Part 3960 Element 396001 ×4
  • Dish 6 x 6 Inverted, Radar / Webbed [No Anti-studs] White Part 4285a ×3
  • Equipment Control Panel White Part 2342 ×3
  • Flexible Hose 8.5L with Tabless Ends (Ends same color as Tube) White Part 73590c01a ×4
  • Hinge Brick 1 x 2 Base White Part 3937 Element 6619287 or 393701 ×12
  • Hinge Brick 1 x 2 Top Plate Thin White Part 3938 Element 393801 ×12
  • Hinge Plate 1 x 2 with 2 Fingers and Hollow Studs White Part 4276b Element 4238278 or 4188547 ×4
  • Hinge Plate 1 x 2 with 3 Fingers [Hollow Studs] White Part 4275b Element 4241120 or 4188523 ×4
  • Hinge Plate 1 x 4 Swivel Top / Base - Solid Clip [Complete Assembly] White Part 73983 Element 6102776 or 4287153 ×1
  • Hinge Vehicle Roof Holder 1 x 4 White Part 4315 Element 4214079 or 4190507 ×2
  • Light Brick 1 x 2 [Single Bulb] White Part 4767 Element 73666 ×1
  • Motor, Monorail 9V with Short Couplings [Complete Assembly] White Part 2684c01a ×1
  • Panel 1 x 2 x 1 [Square Corners] White Part 4865a Element 486501 ×20
  • Panel 3 x 2 x 5 2/3 White Part 2448 ×2
  • Plate 1 x 1 White Part 3024 Element 6548262 or 302401 ×2
  • Plate 1 x 10 White Part 4477 Element 6552113 or 6550148 ×2
  • Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 ×45
  • Plate 1 x 3 White Part 3623 Element 6552105 or 6550144 ×2
  • Plate 1 x 4 White Part 3710 Element 6552108 or 6548266 ×25
  • Plate 1 x 8 White Part 3460 Element 6550141 or 346001 ×10
  • Plate 2 x 10 White Part 3832 Element 6552109 or 383201 ×8
  • Plate 2 x 2 White Part 3022 Element 6552099 or 6548260 ×7
  • Plate 2 x 2 Corner White Part 2420 Element 6548254 or 242051 ×4
  • Plate 2 x 3 White Part 3021 Element 6550136 or 302101 ×1
  • Plate 2 x 4 White Part 3020 Element 6552098 or 302001 ×1
  • Plate 2 x 6 White Part 3795 Element 6550146 or 379501 ×9
  • Plate 2 x 8 White Part 3034 Element 6552101 or 303401 ×7
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) White Part 4032a Element 6601914 or 403201 ×2
  • Plate Special 1 x 1 with Clip Light, Bar Hole [Thick Ring] White Part 4081b Element 6281990 or 4632566 ×8
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) White Part 3794a ×2
  • Plate Special 1 x 2 with Long Stud Receptacle (Space Wing) White Part 4596 Element 6287500 or 4625000 ×6
  • Support 2 x 4 x 5 Stanchion Inclined [5mm wide posts] White Part 4476b Element 4142125 or 447601 ×6
  • Support Round 2 x 2 x 2 Stand with Reach-Through Center Hole White Part 3940b Element 4288059 or 4164236 ×8
  • Technic Plate 2 x 8 [7 Holes] White Part 3738 Element 4527945 or 373801 ×1
  • Technic Rack 1 x 20 x 2/3 White Part 2428 ×2
  • Technic Rack Winder [Complete Assembly] White Part 2426c01 ×1
  • Tile 1 x 1 with Computer Targeting Display Print White Part 3070bpr0039 ×1
  • Tile 1 x 1 with Groove White Part 3070b Element 6550138 or 307001 ×3
  • Tile 1 x 1 with Red and Black Buttons Print White Part 3070bpr0031 ×1
  • Tile 1 x 2 with Arrow Long Yellow with Black Border Print White Part 3069bpr0023 Element 80533 ×6
  • Tile 1 x 2 with Groove White Part 3069b Element 6548264 or 306901 ×14
  • Tile 1 x 4 with Groove White Part 2431 Element 6548255 or 243101 ×1
  • Tile 1 x 8 with Groove White Part 4162 Element 6552110 or 416201 ×9
  • Tile 2 x 2 with Arrow Thin Yellow with Black Border Print White Part 3068bpr0032 ×2
  • Tile 2 x 2 with Grill Black Print White Part 3068bpr0031 ×2
  • Tile 2 x 2 with Groove White Part 3068b Element 6548263 or 306801 ×6
  • Turntable 2 x 2 Plate, Base White Part 3680 Element 368001 ×1
  • Wedge Plate 10 x 10 with 4x4 Cutout and Cut Corner White Part 2401 Element 240101 ×2
  • Wedge Plate 3 x 3 Cut Corner White Part 2450 Element 6601842 or 4280148 ×2
  • Window 1 x 2 x 3 Train White Part 4035 Element 6253422 or 4522209 ×2

Black 191 pieces

  • Antenna 1 x 4 with Rounded Top Black Part 3957a ×4
  • Bar 1 x 3 [Clip / Anti-Stud] Black Part 4735 Element 4141580 or 473576 ×4
  • Bracket 1 x 2 - 1 x 4 [Square Corners] Black Part 2436 Element 4282746 or 243626 ×4
  • Bracket 2 x 2 - 1 x 4 Black Part 2422 Element 242226 ×1
  • Bracket 3 x 2 - 2 x 2 [aka Space Seat] Black Part 4598 Element 6021678 or 459826 ×1
  • Brick 1 x 1 Black Part 3005 Element 300526 ×4
  • Brick 1 x 2 Black Part 3004 Element 300426 ×8
  • Brick 1 x 4 Black Part 3010 Element 301026 ×5
  • Brick 1 x 6 Black Part 3009 Element 300926 ×3
  • Brick 2 x 2 Black Part 3003 Element 4103587 or 300326 ×8
  • Brick 2 x 2 Corner Black Part 2357 Element 235776 or 235726 ×1
  • Brick 2 x 3 Black Part 3002 Element 300226 ×2
  • Brick 2 x 4 Black Part 3001 Element 300126 ×1
  • Brick Round 1 x 1 Open Stud Black Part 3062b Element 306226 ×2
  • Brick Round 2 x 2 with Axle Hole Black Part 3941 Element 614376 or 614326 ×12
  • Brick Sloped 33° 3 x 2 Black Part 3298 Element 329826 ×1
  • Brick Sloped 45° 2 x 1 with Bottom Pin Black Part 3040b Element 4121966 or 304026 ×4
  • Brick Sloped 45° 2 x 2 Black Part 3039 Element 303926 ×1
  • Brick Special 1 x 1 with Headlight Black Part 4070 Element 407026 ×4
  • Brick Special 1 x 2 x 2/3 with Studs on Sides Black Part 4595 Element 6681661 or 4523339 ×4
  • Cone 1 x 1 [No Top Groove] Black Part 4589 Element 4518219 or 458926 ×2
  • Engine, Strakes, 2 x 2 Thin Top Plate Black Part 4229 Element 4552040 or 4163480 ×4
  • Equipment Camera with Side Sight [aka Space Gun] Black Part 4360 Element 436026 ×1
  • Equipment Radio [Compact Handle] Black Part 3962a ×1
  • Flexible Hose 8.5L with Tabless Ends (Ends same color as Tube) Black Part 73590c01a ×2
  • Lever Small Base with Black Lever Black Part 298c02 Element 73587 ×4
  • Plate 1 x 10 Black Part 4477 Element 447726 ×1
  • Plate 1 x 2 Black Part 3023 Element 302326 ×5
  • Plate 1 x 3 Black Part 3623 Element 362326 ×4
  • Plate 1 x 4 Black Part 3710 Element 371026 ×3
  • Plate 1 x 6 Black Part 3666 Element 366626 ×2
  • Plate 2 x 16 Black Part 4282 Element 428276 or 428226 ×1
  • Plate 2 x 2 Black Part 3022 Element 302226 ×15
  • Plate 2 x 3 Black Part 3021 Element 302126 ×2
  • Plate 2 x 4 Black Part 3020 Element 302026 ×1
  • Plate 4 x 8 Black Part 3035 Element 303526 ×3
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Black Part 4032a Element 403226 ×8
  • Plate Special 1 x 1 with Clip Light, Bar Hole [Thick Ring] Black Part 4081b Element 6281993 or 4632571 ×8
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Black Part 3794a ×6
  • Plate Special 1 x 2 with Bar Up [Horizontal Arm 6mm] Black Part 4623 Element 4597267 or 462326 ×2
  • Plate Special 1 x 2 with Ladder Black Part 4175 Element 6285241 or 6179557 ×1
  • Plate Special 1 x 4 Offset with Bar Holes Black Part 4590 Element 6002559 or 4278029 ×2
  • Support 2 x 4 x 5 Stanchion Inclined [5mm wide posts] Black Part 4476b Element 6110030 or 4142131 ×2
  • Support 4 x 4 x 5 Stanchion, Tall Studs Black Part 2680 Element 268026 ×2
  • Support 6 x 6 x 10 Stanchion Black Part 2681 Element 268126 ×8
  • Support Round 2 x 2 x 2 Stand with Reach-Through Center Hole Black Part 3940b Element 394026 ×1
  • Technic Rack Winder [Complete Assembly] Black Part 2426c01 ×1
  • Tile 1 x 2 with Groove Black Part 3069b Element 306926 ×12
  • Tile 1 x 4 with Groove Black Part 2431 Element 243126 ×2
  • Tile 1 x 8 with Groove Black Part 4162 Element 416226 ×2
  • Tile 2 x 2 with Groove Black Part 3068b Element 306826 ×1
  • Tool Screwdriver and Spanner / Wrench Black Part 4006 Element 6034000 or 4569095 ×1
  • Turntable 2 x 2 Plate, Base Black Part 3680 Element 368076 or 368026 ×1
  • Vehicle Base, Monorail 4 x 20 Black Part 2687 ×2
  • Weapon Gun / Torch (Space) [with Grooves] Black Part 3959 Element 4254942 or 395976 ×1
  • Wheel Holder, Monorail Bogey with Bogey Bracket/Pivot Black Part 2686c01 ×2
  • Wire with Brick 2 x 2 x 1/3 Pair, 15L Black Part 5306ac015 ×1

Light Gray 44 pieces

  • Baseplate 16 x 32 Light Gray Part 3857 Element 4219612 or 274802 ×1
  • Baseplate 32 x 32 Light Gray Part 3811 Element 4221067 or 4155361 ×1
  • Brick Round 2 x 2 with Axle Hole Light Gray Part 3941 Element 614302 or 394102 ×2
  • Plate 1 x 4 Light Gray Part 3710 Element 371002 ×24
  • Tile Round 2 x 2 with Yellow Arrow with Black Border Print Light Gray Part 4150pr0016 ×2
  • Turntable 2 x 2 Plate - Top Light Gray Part 3679 Element 367952 or 367902 ×2
  • Vehicle Track, Monorail Curve Long Light Gray Part 2672 ×4
  • Vehicle Track, Monorail Monoswitch Light Gray Part 2774 ×2
  • Vehicle Track, Monorail Ramp Lower Part Light Gray Part 2677 ×2
  • Vehicle Track, Monorail Track Ramp Upper Part Light Gray Part 2678 ×2
  • Vehicle Track, Monorail Track Straight Long Light Gray Part 2671 ×2

Trans-Red 38 pieces

  • Antenna 1 x 4 with Rounded Top Trans-Red Part 3957a Element 6065498 or 4106520 ×2
  • Brick Round 1 x 1 Open Stud Trans-Red Part 3062b Element 6514235 or 6238673 ×4
  • Brick Round 1 x 1 x 2/3 Light Bulb Cover Trans-Red Part 4770 Element 4226863 or 477041 ×1
  • Cone 1 x 1 [No Top Groove] Trans-Red Part 4589 Element 618841 ×8
  • Dish 2 x 2 Inverted [Radar] Trans-Red Part 4740 Element 6580377 or 6245303 ×5
  • Plate 1 x 1 Trans-Red Part 3024 Element 6513963 or 6252042 ×8
  • Plate Round 1 x 1 with Solid Stud Trans-Red Part 6141 Element 6514051 or 6208450 ×10

Trans-Dark Blue 29 pieces

  • Antenna 1 x 4 with Rounded Top Trans-Dark Blue Part 3957a ×2
  • Cone 1 x 1 [No Top Groove] Trans-Dark Blue Part 4589 Element 618843 ×8
  • Dish 2 x 2 Inverted [Radar] Trans-Dark Blue Part 4740 Element 6580383 or 6398233 ×1
  • Panel 1 x 2 x 2 [Solid Studs] Trans-Dark Blue Part 4864a ×4
  • Panel 10 x 10 x 12 Quarter Dome Trans-Dark Blue Part 2409 Element 240943 ×2
  • Panel 10 x 6 x 11 Trans-Dark Blue Part 2408 Element 240843 ×1
  • Panel 3 x 2 x 5 2/3 Trans-Dark Blue Part 2448 ×2
  • Plate Round 1 x 1 with Solid Stud Trans-Dark Blue Part 6141 Element 6514055 or 6240214 ×6
  • Windscreen 4 x 4 x 2 Canopy Extender, Hinge Trans-Dark Blue Part 2337 ×1
  • Windscreen 6 x 4 x 2 Canopy Trans-Dark Blue Part 4474 Element 3006643 ×2

Minifigures 5 figures

  • Futuron Spaceman, Yellow with Airtanks and Dark Blue Visor Minifigure, checked as a whole figure ×3
  • Futuron Spaceman, Blue with Airtanks and Dark Blue Visor Minifigure, checked as a whole figure ×2

Tick each piece as you find it, or mark it missing.

When a piece really is missing

Ask LEGO

LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for the set number and each piece's element ID, the number printed beside the piece in the parts list at the back of the instructions. This checker lists both.

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