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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.

Electronic Train

Checking

138 Electronic Train

124 pieces in 40 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

Plates 42 pieces

  • Plate 1 x 1 Black Part 3024 Element 302426 ×4
  • Plate 1 x 2 Black Part 3023 Element 302326 ×10
  • Plate 2 x 2 Black Part 3022 Element 302226 ×6
  • Plate 2 x 3 Black Part 3021 Element 302126 ×6
  • Plate 2 x 4 Black Part 3020 Element 302026 ×6
  • Plate 1 x 1 Red Part 3024 Element 302421 ×2
  • Plate 1 x 2 Red Part 3023 Element 302321 ×4
  • Plate 2 x 8 White Part 3034 Element 6552101 or 303401 ×3
  • Plate 2 x 2 Yellow Part 3022 Element 4613978 or 302224 ×1

Wheels and Tyres 28 pieces

  • Technic Tread Crawler Wedge Black Part 498a ×2
  • Tyre Smooth Old Style - Small Black Part 132a ×4
  • Tyre for Train Wheel for Electric Train Motor 12V Light Gray Part 458 ×8
  • Train Wheel Spoked for Motor Red Part upn0383a ×8
  • Wheel Old with 4 Studs Red Part 7039 Element 7039 ×4
  • Brick Special 2 x 4 with Wheel Holder Old, Clear Bottom, Red Inside White Part 7049bc01 ×2

Bricks 26 pieces

  • Brick 1 x 1 Black Part 3005 Element 300526 ×8
  • Brick 1 x 4 Black Part 3010 Element 301026 ×1
  • Brick 1 x 6 Black Part 3009 Element 300926 ×7
  • Brick 1 x 8 Black Part 3008 Element 300826 ×2
  • Brick 2 x 4 without Cross Supports Black Part 3001a ×4
  • Brick 1 x 1 Trans-Clear Part 3005 Element 6514207 or 6220959 ×2
  • Brick 1 x 2 Trans-Clear Part 3004 Element 4256587 or 300410 ×2

Electronics 11 pieces

  • Battery Box, 4.5V 7 x 11 x 3 Type 2 [Complete Assembly] Black Part 468c02 ×1
  • Motor, Train, 4.5V, 4 x 12 x 3 1/3 Type 1 Black Part 564c01 ×1
  • Whistle, Train 4.5V, Adjustable with Yellow Base Black Part upn0312bc01 ×1
  • Electric Connector, 2 Way Male Rounded Narrow Type 2 with Hollow Pins Blue Part 236ac01 ×2
  • Electric Connector, 2 Way Male Rounded Narrow Type 2 with Hollow Pins Red Part 236ac01 ×2
  • Control Unit, Train 4.5V Whistle Brick 4 x 8 x 2 with Forward/Stop/Reverse Functions Trans-Clear Part upn0313b ×1
  • Microphone, Train 4.5V 4 x 4 x 2 with Vertical Plug Sockets White Part upn0311b ×1
  • Wire 12V / 4.5V with Two Leads [Undetermined Length] White Part 74503 ×2

Bricks Sloped 5 pieces

  • Brick Sloped 45° 2 x 1 without Bottom Pin Black Part 3040a ×4
  • Brick Sloped 45° 2 x 2 Black Part 3039 Element 303926 ×1

Magnets and Holders 4 pieces

  • Plate Special 2 x 4 with Train Coupler Open with Magnet Short Cylinder Blue Red Part 737ac02 ×2
  • Plate Special 2 x 4 with Train Coupler Open with Magnet Short Cylinder Red Red Part 737ac01 ×2

Transportation - Land 4 pieces

  • Vehicle Track, Train, Tapered Rail Curved Inside Blue Part 3230a ×1
  • Vehicle Track, Train, Tapered Rail Curved Outside Blue Part 3229a ×1
  • Vehicle Track, Train, Tapered Rail Straight 16L Blue Part 3228a ×2

Windows and Doors 2 pieces

  • Window 1 x 1 x 1 Classic with Long Sill [Complete] Red Part 3087bc01 ×2

Bricks Round and Cones 1 piece

  • Brick Round 1 x 1 Solid Stud Black Part 3062a ×1

Plates Special 1 piece

  • Plate Special 6 x 16 with Motor Opening Wide Light Gray Part 3058b ×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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