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LEGO Missing Piece Checker

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.

Train Cars

Checking

2126 Train Cars

363 pieces in 121 part and color combinations, plus 5 minifigures.

LEGO counts 378 pieces. This inventory comes from a separate parts catalog and lists 383, including the 20 parts inside the minifigures; the two do not always count the same elements, so their totals differ. 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

Plates 75 pieces

  • 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 ×5
  • Plate 2 x 12 Black Part 2445 Element 244526 ×1
  • Plate 2 x 2 Black Part 3022 Element 302226 ×2
  • Plate 2 x 2 Corner Black Part 2420 Element 242026 ×2
  • Plate 2 x 4 Black Part 3020 Element 302026 ×4
  • Plate 2 x 6 Black Part 3795 Element 379526 ×1
  • Plate 4 x 4 Black Part 3031 Element 4243819 or 303126 ×4
  • Plate 6 x 16 Black Part 3027 Element 302726 ×2
  • Plate 2 x 4 Light Gray Part 3020 Element 302002 ×7
  • Plate 2 x 8 Light Gray Part 3034 Element 303402 ×2
  • Plate 1 x 1 Trans-Yellow Part 3024 Element 6513966 or 6252045 ×8
  • Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 ×5
  • Plate 1 x 4 White Part 3710 Element 6552108 or 6548266 ×1
  • Plate 2 x 6 White Part 3795 Element 6550146 or 379501 ×4
  • Plate 1 x 2 Yellow Part 3023 Element 302324 ×2
  • Plate 1 x 4 Yellow Part 3710 Element 371024 ×1
  • Plate 2 x 2 Yellow Part 3022 Element 4613978 or 302224 ×12
  • Plate 2 x 3 Yellow Part 3021 Element 302124 ×1
  • Plate 2 x 6 Yellow Part 3795 Element 379524 ×1
  • Plate 4 x 8 Yellow Part 3035 Element 303524 ×1

Transportation - Land 33 pieces

  • Train Buffer Beam Black Part 4022 Element 4109853 or 402276 ×8
  • Vehicle Base 4 x 7 x 2/3 with 3 x 4 Recessed, Wheel Pins Black Part 2441 Element 6482877 or 6349350 ×2
  • Vehicle Base, Train 6 x 24 with Two 1 x 2 Cutouts and 3 Round Holes Each End Black Part 6584 Element 4159942 or 658476 ×1
  • Wheel Holder, Train with Wheels [Complete Assembly] Black Part 2878c01 Element 4207401 or 74784 ×12
  • Steering Stand 1 x 2 with Black Steering Wheel Light Gray Part 3829c01 Element 9556 ×3
  • Vehicle Base, Train 6 x 24 with Two 1 x 2 Cutouts and 3 Round Holes Each End Red Part 6584 Element 658421 ×1
  • Wheel Arch, Mudguard 2 x 4 Studded Red Part 3788 Element 378821 ×1
  • Wheel Arch, Mudguard, Slope 3 x 4 Red Part 2513 Element 251321 ×1
  • Wheel Arch, Mudguard 2 x 4 Studded White Part 3788 Element 4289272 ×1
  • Wheel Arch, Mudguard, Slope 3 x 4 White Part 2513 Element 251301 ×1
  • Tipper Bed 4 x 6, Open Studs Yellow Part 4080 Element 408024 ×1
  • Vehicle Base 4 x 5 with Wheel Arches, 2 x 2 Opening Yellow Part 4211 Element 4261115 or 421124 ×1

Bricks Sloped 32 pieces

  • 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 with Horizon Screen Print Black Part 3039pr9973 Element 4240154 or 82056 ×1
  • Brick Sloped 45° 2 x 1 with Bottom Pin Blue Part 3040b Element 4121936 or 304023 ×10
  • Brick Sloped 45° 2 x 1 with Bottom Pin Light Gray Part 3040b Element 4121933 or 304002 ×8
  • Brick Sloped 45° 2 x 1 with Bottom pin, with 3 White Buttons, Red and Green Lamps Print Light Gray Part 3040bpr0006 Element 4121974 or 82519 ×2
  • Brick Sloped 75° 2 x 1 x 3 with Open Stud Yellow Part 4460a ×4
  • Brick Sloped 75° 2 x 2 x 3 [Hollow Studs] Yellow Part 3684 Element 4248062 or 4189348 ×2

Wheels and Tyres 32 pieces

  • Train Wheel Small Black Part 2927 Element 4227798 or 4163080 ×4
  • Tyre 15 x 6 Offset Tread Small Black Part 3641 Element 4501046 or 364126 ×8
  • Tyre 21 x 8 Offset Tread Medium Black Part 4084 ×6
  • Wheel 8 x 6 White Part 4624 Element 462401 ×4
  • Wheel 8 x 6 Yellow Part 4624 Element 6133542 or 462424 ×10

Plates Special 20 pieces

  • Bracket 1 x 2 - 1 x 4 [Square Corners] Black Part 2436 Element 4282746 or 243626 ×5
  • Plate Special 1 x 2 with Ladder Black Part 4175 Element 6285241 or 6179557 ×4
  • Plate Special 1 x 4 with Wheels Holder Black Part 2926 Element 6338416 or 292626 ×2
  • Plate Special 2 x 2 with Wheels Holder Wide Light Gray Part 6157 Element 4109649 ×3
  • Plate Special 1 x 1 with Clip Vertical [Thick U Clip] Yellow Part 4085c Element 408524 ×4
  • Plate Special 1 x 2 with Ladder Yellow Part 4175 Element 6252195 or 6186664 ×2

Hinges, Arms and Turntables 19 pieces

  • Hinge Plate 2 x 9 with Hole Close to Hinge [Complete Assembly] Black Part 3324ac01 Element 4187212 or 4106945 ×1
  • Hinge Vehicle Roof Holder 1 x 4 Black Part 4315 Element 4250225 or 431576 ×8
  • Hinge Vehicle Roof 4 x 4 Light Gray Part 4213 Element 4256455 or 421302 ×1
  • Hinge Vehicle Roof Holder 1 x 4 x 2 Light Gray Part 4214 Element 421402 ×1
  • Hinge Train Gate 2 x 4 Red Part 2873 Element 4240391 or 287371 ×8

Tiles 17 pieces

  • Tile 1 x 2 with Arrow Long Yellow with Black Border Print Black Part 3069bpr9981 Element 81067 ×4
  • Tile 1 x 2 with Groove Light Gray Part 3069b Element 306902 ×2
  • Tile 1 x 1 with Groove Trans-Red Part 3070b Element 6581817 or 6254248 1 spare in the box ×4
  • Tile 1 x 2 with Red and Yellow Control Panel Print (Original) White Part 3069bpr0048 Element 4264367 or 81515 ×1
  • Tile 1 x 4 with Groove White Part 2431 Element 6548255 or 243101 ×1
  • Tile 1 x 4 with Red and White Danger Stripes Red Print White Part 2431pr0077 Element 6102861 or 81266 ×2
  • Tile 2 x 2 with Groove White Part 3068b Element 6548263 or 306801 ×3

Magnets and Holders 16 pieces

  • Magnet Cylindrical Black Part 73092 Element 73092 ×8
  • Train Coupling New Black Part 2920 Element 4299239 or 292076 ×8

Bricks 12 pieces

  • Brick 2 x 4 Black Part 3001 Element 300126 ×2
  • Brick 1 x 12 Blue Part 6112 Element 6305460 or 6175821 ×1
  • Brick 2 x 6 Blue Part 2456 Element 4181139 or 245623 ×1
  • Brick 1 x 4 Red Part 3010 Element 301021 ×4
  • Brick 1 x 2 Yellow Part 3004 Element 4613966 or 300424 ×2
  • Brick 2 x 2 Yellow Part 3003 Element 4103588 or 300374 ×1
  • Brick 2 x 6 Yellow Part 2456 Element 4181143 or 245624 ×1

Technic Bricks 12 pieces

  • Technic Brick 1 x 2 [1 Pin Hole] Yellow Part 3700 Element 370024 ×12

Tiles Special 12 pieces

  • Tile Special 1 x 2 with Handle Black Part 2432 Element 243226 ×2
  • Tile Special 6 x 4 with Beveled Edges and 5mm Pin (Train Bogie Plate) Black Part 4025 Element 6096842 or 6051914 ×4
  • Tile Special 1 x 2 with Handle Red Part 2432 Element 243221 ×1
  • Tile Special 1 x 2 Grille with Bottom Groove White Part 2412b Element 6601902 or 241201 ×2
  • Tile Special 1 x 2 Grille with Bottom Groove Yellow Part 2412b Element 241224 ×3

Bricks Round and Cones 11 pieces

  • Brick Round 1 x 1 Open Stud Light Gray Part 3062b Element 306202 ×10
  • Brick Round 2 x 2 with Axle Hole White Part 3941 Element 6601920 or 614351 ×1

Bricks Special 11 pieces

  • Brick Special 1 x 2 with Grille Black Part 2877 Element 287726 ×5
  • Brick Special 1 x 4 with Groove Black Part 2653 Element 265326 ×2
  • Brick Special 1 x 1 with Headlight Blue Part 4070 Element 407023 ×2
  • Brick Special 1 x 1 with Headlight Light Gray Part 4070 Element 407002 ×2

Bars, Ladders and Fences 10 pieces

  • Plate Special 1 x 6 with Train Wagon End Fence Black Part 6583 Element 6271649 or 658326 ×6
  • Plate Special 1 x 6 with Train Wagon End Fence Light Gray Part 6583 Element 658302 ×2
  • Plate Special 1 x 6 with Train Wagon End Fence Yellow Part 6583 Element 6271645 or 4251468 ×2

Panels 8 pieces

  • Panel 1 x 2 x 1 [Square Corners] Light Gray Part 4865a Element 486502 ×4
  • Panel, Trapezoid, Tipper End Flat without Pins Yellow Part 30022 Element 6293858 or 6095756 ×4

Minifig Accessories 7 pieces

  • Equipment Radio [Extended Handle, Compact Speaker Grille] Black Part 3962b Element 396226 ×2
  • Tap 1 x 1 with Hole in Spout Black Part 4599a ×1
  • Equipment Brush / Push Broom Brown Part 3836 Element 383625 ×1
  • Equipment Shovel [Rounded Handle End] Dark Gray Part 3837 Element 383727 ×1
  • Equipment Weapon, Loudhailer / Speaker / Blaster / Space Gun Light Gray Part 4349 Element 434902 ×2

Minifig Shields, Weapons, & Tools 7 pieces

  • Tool Drill, Electric Dark Gray Part 55297 ×1
  • Tool Hammer Cross Pein [6-Rib Handle] Dark Gray Part 55295 ×1
  • Tool Oil Can [Smooth Handle] Dark Gray Part 55296 ×1
  • Tool Pickaxe Dark Gray Part 3841 Element 384127 ×1
  • Tool Screwdriver with Narrow Head [6-Rib Handle] Dark Gray Part 55298 ×1
  • Tool Wrench / Spanner Open End [6-Rib Handle] Dark Gray Part 55299 ×1
  • Tool Wrench / Spanner, Box [6-Rib Handle] Dark Gray Part 55300 ×1

Plates Round Curved and Dishes 7 pieces

  • Dish 4 x 4 Inverted [Radar] Black Part 3960 Element 396026 ×3
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Green Part 4032a Element 403228 ×1
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Red Part 4032a Element 403221 ×1
  • Plate Round 1 x 1 with Solid Stud Trans-Neon Green Part 6141 Element 6240223 or 3005749 1 spare in the box ×2

Windows and Doors 6 pieces

  • Door 1 x 3 x 1 Left Black Part 3822 Element 6024114 or 382226 ×1
  • Door 1 x 3 x 1 Right Black Part 3821 Element 6024113 or 4141587 ×1
  • Door 1 x 3 x 1 Left Red Part 3822 Element 4288209 or 4188202 ×1
  • Door 1 x 3 x 1 Right Red Part 3821 Element 4537986 or 4288208 ×1
  • Door 1 x 3 x 1 Left White Part 3822 Element 4527637 or 4161547 ×1
  • Door 1 x 3 x 1 Right White Part 3821 Element 4537987 or 4527638 ×1

Technic Pins 4 pieces

  • Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Black Part 6558 Element 655826 ×4

Containers 3 pieces

  • Barrel 4 x 4 x 3.5 Brown Part 30139 Element 4161007 or 4114255 ×3

Plants & Trees 3 pieces

  • Plant, Pine Tree - Small 2 x 2 x 4 Green Part 2435 Element 6268823 or 243578 ×2
  • Plant, Pine Tree, Large, 4 x 4 x 6 2/3 Green Part 3471 Element 6248463 or 347128 ×1

Windscreens and Fuselage 3 pieces

  • Windscreen 2 x 4 x 2 Trans-Light Blue Part 3823 Element 6581802 or 6253682 ×1
  • Windscreen 3 x 4 x 1 1/3 with 2 Studs on Top Trans-Light Blue Part 2437 Element 6507914 or 6253361 ×2

Tubes and Hoses 2 pieces

  • Flexible Hose 8.5L with Tabbed Ends (Ends same color as Tube) Light Gray Part 73590c02a Element 621132 ×2

Stickers 1 piece

  • Sticker Sheet for Set 2126-1 [No Color/Any Color] Part 72022 Element 4112957 ×1

Minifigures 5 figures

  • Conductor - Yellow Jacket, Black legs, Red Hat Minifigure, checked as a whole figure ×1
  • Man - Brown Jacket, Yellow Legs, Blue Cap Minifigure, checked as a whole figure ×1
  • Woman - Blue Jogging Suite, Dark Gray Legs Minifigure, checked as a whole figure ×1
  • Train Worker - Red Vest, Black Legs, White Helmet, Sunglasses Minifigure, checked as a whole figure ×1
  • Train Worker - Red Vest, Black Legs, White Helmet, Mustache Minifigure, checked as a whole figure ×1

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.

Request a replacement from LEGO

Buy the piece

Mark a piece missing and your list links it to an eBay search for that part, which also covers pieces from older or second-hand sets.

Keep a record

Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.

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