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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.

Large Locomotive (base unit without color trim elements)

Checking

3741 Large Locomotive (base unit without color trim elements)

91 pieces in 29 part and color combinations.

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

Black 74 pieces

  • Bar 6.6L with Stop Ring [Umbrella Stand] Black Part 4095 Element 409526 ×2
  • Brick 1 x 4 Black Part 3010 Element 301026 ×5
  • Brick 1 x 6 Black Part 3009 Element 300926 ×1
  • Brick 2 x 4 Black Part 3001 Element 300126 ×2
  • Brick Arch 1 x 6 Black Part 3455 Element 345526 ×4
  • Brick Round 2 x 2 Dome Top, Blocked Open Stud, Bottom Axle Holder Black Part 30367b Element 4158779 ×2
  • Brick Sloped 45° 2 x 1 with Bottom Pin Black Part 3040b Element 4121966 or 304026 ×2
  • Brick Sloped 65° 2 x 2 x 2 Smooth without Bottom Tube Black Part 3678a Element 367826 ×6
  • Brick Sloped Inverted 75° 2 x 1 x 3 Black Part 2449 Element 4636202 or 4561789 ×2
  • Brick Special 1 x 1 with Headlight Black Part 4070 Element 407026 ×4
  • Magnet Cylindrical Black Part 73092 Element 73092 ×2
  • Panel 1 x 2 x 1 [Square Corners] Black Part 4865a Element 486526 ×2
  • Plate 1 x 2 Black Part 3023 Element 302326 ×1
  • Plate 2 x 4 Black Part 3020 Element 302026 ×2
  • Plate Special 1 x 1 with Clip Horizontal [Thick U Clip] Black Part 6019 Element 601976 or 601926 ×4
  • Plate Special 1 x 2 with Bar Up [Horizontal Arm 6mm] Black Part 4623 Element 4597267 or 462326 ×1
  • Plate Special 1 x 2 with Door Rail Black Part 32028 Element 4107761 ×16
  • Tile 1 x 4 with Groove Black Part 2431 Element 243126 ×1
  • Tile Special 6 x 4 with Beveled Edges and 5mm Pin (Train Bogie Plate) Black Part 4025 Element 6096842 or 6051914 ×2
  • Train Buffer Beam Black Part 4022 Element 4109853 or 402276 ×2
  • Train Coupling New Black Part 2920 Element 4299239 or 292076 ×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 ×4
  • Window 1 x 2 x 2 Plane, Solid Studs Black Part 2377 Element 237726 ×4

Light Gray 16 pieces

  • Plate 2 x 10 Light Gray Part 3832 Element 383202 ×2
  • Plate 2 x 3 Light Gray Part 3021 Element 302102 ×4
  • Plate 2 x 6 Light Gray Part 3795 Element 379502 ×8
  • Plate 4 x 4 Light Gray Part 3031 Element 4243813 or 303102 ×2

Yellow 1 piece

  • Cone 1 x 1 [No Top Groove] Yellow Part 4589 Element 458924 ×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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