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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.

Diesel Heavy Shunting Locomotive

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7755 Diesel Heavy Shunting Locomotive

160 pieces in 56 part and color combinations, plus 1 minifigure.

The official piece count includes the 4 parts inside the set's minifigures, which this inventory lists separately. 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 43 pieces

  • Plate 1 x 2 Black Part 3023 Element 302326 ×2
  • Plate 1 x 4 Black Part 3710 Element 371026 ×2
  • Plate 1 x 6 Black Part 3666 Element 366626 ×2
  • Plate 2 x 2 Black Part 3022 Element 302226 ×2
  • Plate 2 x 3 Black Part 3021 Element 302126 ×4
  • Plate 2 x 4 Black Part 3020 Element 302026 ×3
  • Plate 2 x 6 Black Part 3795 Element 379526 ×5
  • Plate 4 x 12 Black Part 3029 Element 302926 ×1
  • Plate 4 x 4 Black Part 3031 Element 4243819 or 303126 ×1
  • Plate 1 x 2 Light Gray Part 3023 Element 302302 ×4
  • Plate 2 x 2 Light Gray Part 3022 Element 302202 ×4
  • Plate 2 x 4 Light Gray Part 3020 Element 302002 ×2
  • Plate 1 x 2 Red Part 3023 Element 302321 ×5
  • Plate 1 x 4 Red Part 3710 Element 371021 ×4
  • Plate 1 x 6 Red Part 3666 Element 366621 ×2

Bricks 38 pieces

  • Brick 1 x 4 Black Part 3010 Element 301026 ×4
  • Brick 1 x 1 Light Gray Part 3005 Element 300502 ×4
  • Brick 1 x 4 Light Gray Part 3010 Element 301002 ×2
  • Brick 1 x 8 Light Gray Part 3008 Element 300802 ×4
  • Brick 2 x 2 without Inside Ridges Light Gray Part 3003a ×4
  • Brick 1 x 2 Red Part 3004 Element 4613961 or 300421 ×12
  • Brick 2 x 4 Red Part 3001 Element 300121 ×4
  • Brick 2 x 8 Red Part 3007 Element 6036408 or 300721 ×4

Bricks Special 12 pieces

  • Brick Special 1 x 1 with Headlight Red Part 4070 Element 407021 ×2
  • Brick Special 1 x 1 x 2 with Shutter Holder Red Part 3581 Element 4207299 or 358121 ×8
  • Brick Special 2 x 6 x 2 Weight with Bottom Openings and Center Seams on Ends Red Part 73090a ×2

Windows and Doors 12 pieces

  • Door 1 x 4 x 5 Train Left Red Part 4181 Element 4502192 or 4100372 ×1
  • Door 1 x 4 x 5 Train Right Red Part 4182 Element 6219679 or 4297084 ×1
  • Window 1 x 2 x 2 Shutter Red Part 3582 Element 358221 ×8
  • Glass for Train Door Lip On Top and Bottom Trans-Clear Part 4183 Element 418340 ×2

Wheels and Tyres 11 pieces

  • Wheel Train for 12V Electric Motor Black Part 867 ×2
  • Wheels Train Spoked Small (23mm D.) and Black Brick, Modified 2 x 4 [Black] Black Part 4180c01 ×3
  • Tyre for Train Wheel for Electric Train Motor 12V Light Gray Part 458 ×6

Plates Special 10 pieces

  • Plate Special 1 x 1 with Clip Light, Bar Hole [Thin Ring] Light Gray Part 4081a ×2
  • Plate Special 1 x 2 with Ladder Light Gray Part 4175 Element 4100526 or 417502 ×2
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Red Part 3794a ×2
  • Plate Special 1 x 2 with Ladder Red Part 4175 Element 6285246 or 6179575 ×4

Plates Round Curved and Dishes 8 pieces

  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Black Part 4032a Element 403226 ×4
  • Plate Round 1 x 1 with Solid Stud Trans-Clear Part 6141 Element 6514052 or 6240030 ×2
  • Plate Round 1 x 1 with Solid Stud Trans-Red Part 6141 Element 6514051 or 6208450 ×2

Tiles 6 pieces

  • Tile 1 x 2 with Groove Black Part 3069b Element 306926 ×4
  • Tile 2 x 2 with Groove Black Part 3068b Element 306826 ×2

Bricks Sloped 5 pieces

  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Black Part 3660 Element 366026 ×2
  • Brick Sloped 33° 6 x 6 Double (Train Roof) Light Gray Part 4509 Element 4201555 or 450902 ×1
  • Brick Sloped 45° 2 x 2 Light Gray Part 3039 Element 303902 ×1
  • Brick Sloped 45° 2 x 2 with Computer Panel Print Light Gray Part 3039pr9994 ×1

Magnets and Holders 4 pieces

  • Magnet Cylindrical Black Part 73092 Element 73092 ×2
  • Train Coupling Black Part 4023 ×2

Transportation - Land 3 pieces

  • Train Buffer Beam Black Part 4022 Element 4109853 or 402276 ×2
  • Vehicle Base, Train 6 x 28 with Two 1 x 2 Openings [10 Round Holes Each End and 1 Round Hole at Center] Black Part 4093b ×1

Bars, Ladders and Fences 2 pieces

  • Bar 1 x 4 x 2 with Studs Light Gray Part 4083 Element 408302 ×2

Windscreens and Fuselage 2 pieces

  • Windscreen 2 x 6 x 2, Wide Top Trans-Clear Part 4176 Element 4502193 or 4179426 ×2

Electronics 1 piece

  • Motor, Train Base, 12V Unslotted with 3-Hole Plugs Black Part 501b ×1

Minifig Shields, Weapons, & Tools 1 piece

  • Tool Screwdriver and Spanner / Wrench Black Part 4006 Element 6034000 or 4569095 ×1

Stickers 1 piece

  • Sticker Sheet for Set 7755-1 [No Color/Any Color] Part 195475 ×1

Tiles Special 1 piece

  • Tile Special 6 x 4 with Beveled Edges and 7mm Pin (Train Bogie Plate) Black Part 4092 ×1

Minifigures 1 figure

  • Man - Blue Jacket, Blue Legs, Red Hat 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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