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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 Diesel Locomotive with Crane and Tipper Wagon

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724 12V Diesel Locomotive with Crane and Tipper Wagon

152 pieces in 41 part and color combinations.

LEGO counts 155 pieces. This inventory comes from a separate parts catalog and lists 152; 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

Blue 48 pieces

  • Train Track 12V Conducting Rail Curved [No Cable Connection Holes] Blue Part 3241b ×16
  • Vehicle Track, Train, Tapered Rail Curved Inside Blue Part 3230a ×16
  • Vehicle Track, Train, Tapered Rail Curved Outside Blue Part 3229a ×16

Yellow 36 pieces

  • Brick 1 x 1 Yellow Part 3005 Element 300524 ×8
  • Brick 1 x 2 Yellow Part 3004 Element 4613966 or 300424 ×3
  • Brick 1 x 4 Yellow Part 3010 Element 301024 ×4
  • Brick 1 x 6 Yellow Part 3009 Element 300924 ×4
  • Brick 1 x 8 Yellow Part 3008 Element 300824 ×2
  • Brick 2 x 2 without Inside Ridges Yellow Part 3003a ×3
  • Brick 2 x 4 without Cross Supports Yellow Part 3001a ×4
  • Door 1 x 3 x 3 Left with Window and Horizontal Handle Yellow Part 801a ×1
  • Door 1 x 3 x 3 Right with Window and Horizontal Handle Yellow Part 802a ×1
  • Plate 2 x 3 Yellow Part 3021 Element 302124 ×2
  • Window 1 x 1 x 1 Classic with Short Sill, No Glass Yellow Part 3087c ×2
  • Window 1 x 1 x 2, Short Lip [no Glass] Yellow Part 29 ×2

Black 30 pieces

  • Brick 1 x 4 Black Part 3010 Element 301026 ×5
  • Brick 2 x 4, 12V with Power Pickups for Train Motor and Solid Pins Black Part 433c01 ×2
  • Brick Round 1 x 1 Solid Stud Black Part 3062a ×5
  • Brick Sloped 45° 2 x 1 without Bottom Pin Black Part 3040a ×4
  • Motor, Train, 12V 12 x 4 x 3 1/3 Type I with Two Side Holes Black Part upn0274c02 ×1
  • Plate 2 x 2 Black Part 3022 Element 302226 ×1
  • Plate 2 x 3 Black Part 3021 Element 302126 ×2
  • Plate 4 x 6 Black Part 3032 Element 303226 ×2
  • String Cord Thin (0.5mm) [Undetermined Length] Black Part 56823 Element 7009426 ×1
  • Train Base 6 x 12 Type 1 with Wheels and Magnets [Complete Assembly] Black Part 270c02 ×2
  • Train Base 6 x 16 Old with Magnets Black Part 4178a ×1
  • Tyre for Train Wheel for Electric Train Motor 12V Black Part 458 ×4

Red 20 pieces

  • Hinge Plate 2 x 5 with Large Hole [Complete Assembly] Red Part 3149bc01 Element 4188477 or 4106942 ×1
  • Hinge Plate 2 x 9 with Hole Close to Hinge [Complete Assembly] Red Part 3324ac01 ×1
  • Hook, Plate 1 x 2 with Crane Hook Right Red Part 3127b ×1
  • Panel, Trapezoid, Tipper End Flat with Pins, 1 x 2 Anti-studs Red Part 3145 ×2
  • Plate 1 x 2 Red Part 3023 Element 302321 ×2
  • Plate 2 x 2 Red Part 3022 Element 4613974 or 302221 ×2
  • Plate 2 x 8 Red Part 3034 Element 303421 ×1
  • Plate 4 x 8 Red Part 3035 Element 303521 ×2
  • Plate Special 3 x 2 with Rounded End, Hole Red Part 3176 Element 4188189 or 317621 ×3
  • Train Wheel Spoked for Motor Red Part upn0383a ×4
  • Turntable 4 x 4 - Old Type Complete - Faceted Red Part 3404ac01 ×1

White 16 pieces

  • Plate 2 x 8 White Part 3034 Element 6552101 or 303401 ×16

Light Gray 1 piece

  • Wire with 2-Prong Connector with Cap, and Train Track Contact Base, 97cm [Complete Assembly] Light Gray Part 2913c02 ×1

[No Color/Any Color] 1 piece

  • Sticker Sheet for Set 724-1 [No Color/Any Color] Part stickerupn0082 ×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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