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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.

12V Locomotive

Checking

727 12V Locomotive

134 pieces in 30 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 73 pieces

  • Brick 1 x 2 Black Part 3004 Element 300426 ×2
  • Brick 2 x 4, 12V with Power Pickups for Train Motor and Cross-cut Pins Black Part 429c02 ×2
  • Brick Special 1 x 1 x 2 with Shutter Holder Black Part 3581 Element 4541684 or 4264751 ×8
  • Motor, Train, 12V 12 x 4 x 3 1/3 Type II with Three Side Holes Black Part upn0274c01 ×1
  • Plate 1 x 2 Black Part 3023 Element 302326 ×22
  • Plate 1 x 8 Black Part 3460 Element 346026 ×4
  • Plate 2 x 4 Black Part 3020 Element 302026 ×6
  • Plate 6 x 16 Black Part 3027 Element 302726 ×1
  • Train Base 6 x 22 with Magnets Black Part upn0278c01 ×1
  • Train Brick 2 x 4 x 1 1/3 Sliding Wheel Block - Type B with Ledge Black Part upn0184b ×2
  • Train Wheel Spoked for Motor Black Part upn0383a ×8
  • Tyre for Train Wheel for Electric Train Motor 12V Black Part 458 ×8
  • Window 1 x 2 x 2 Shutter Black Part 3582 ×8

Red 32 pieces

  • Brick 1 x 1 Red Part 3005 Element 300521 ×8
  • Brick 1 x 4 Red Part 3010 Element 301021 ×2
  • Brick 1 x 6 Red Part 3009 Element 300921 ×8
  • Brick 1 x 8 with Bottom Tubes and 3 Lowered Cross Supports Red Part 3008b ×4
  • Brick 2 x 8 Red Part 3007 Element 6036408 or 300721 ×2
  • Plate 1 x 2 Red Part 3023 Element 302321 ×4
  • Plate 2 x 3 Red Part 3021 Element 302121 ×4

Trans-Clear 14 pieces

  • Brick 1 x 1 Trans-Clear Part 3005 Element 6514207 or 6220959 ×4
  • Brick 1 x 2 x 2 with Train Window Print Trans-Clear Part 772pr0001 ×4
  • Brick 1 x 6 Trans-Clear Part 3009 Element 4235131 or 4130397 ×2
  • Brick Sloped 45° 2 x 3 Trans-Clear Part 3038 Element 303840 or 303810 ×4

Yellow 10 pieces

  • Plate 1 x 4 Yellow Part 3710 Element 371024 ×2
  • Plate 1 x 8 Yellow Part 3460 Element 346024 ×4
  • Plate 2 x 3 Yellow Part 3021 Element 302124 ×4

Light Gray 4 pieces

  • Brick Sloped 33° 3 x 2 Light Gray Part 3298 Element 329802 ×2
  • Engine - Smooth, Small 1 x 2 Side Plate [No Axle Holders] Light Gray Part 3475a ×2

[No Color/Any Color] 1 piece

  • Sticker Sheet for Set 727-1 [No Color/Any Color] Part 3811stk ×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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