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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.

Steam Engine

Checking

7750 Steam Engine

260 pieces in 90 part and color combinations, plus 2 minifigures.

The piece count includes the 8 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

Black 164 pieces

  • Brick 1 x 1 Black Part 3005 Element 300526 ×6
  • Brick 1 x 2 Black Part 3004 Element 300426 ×14
  • Brick 1 x 3 Black Part 3622 Element 362226 ×2
  • Brick 1 x 4 Black Part 3010 Element 301026 ×4
  • Brick 1 x 6 Black Part 3009 Element 300926 ×8
  • Brick 1 x 8 Black Part 3008 Element 300826 ×6
  • Brick 2 x 2 without Inside Ridges Black Part 3003a ×1
  • Brick 2 x 4 without Cross Supports Black Part 3001a ×1
  • Brick Round 1 x 1 Solid Stud Black Part 3062a ×1
  • Brick Round 2 x 2 with Axle Hole Black Part 3941 Element 614376 or 614326 ×3
  • Brick Sloped 33° 3 x 4 Black Part 3297 Element 6435854 or 329726 ×4
  • Brick Sloped 45° 2 x 1 with Bottom Pin Black Part 3040b Element 4121966 or 304026 ×2
  • Brick Sloped 45° 2 x 2 Black Part 3039 Element 303926 ×5
  • Brick Sloped 45° 2 x 4 Black Part 3037 Element 303726 ×6
  • Brick Sloped Inverted 45° 2 x 1 Black Part 3665 Element 366526 ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Black Part 3660 Element 366026 ×2
  • Brick Special 1 x 2 with Cable Holding Square Cutout Black Part 3134 ×2
  • Brick Special 2 x 6 x 2 Weight with Bottom Openings and Center Seams on Ends Black Part 73090a ×2
  • Door 1 x 4 x 5 Train Left Black Part 4181 Element 6192824 or 4111856 ×1
  • Door 1 x 4 x 5 Train Right Black Part 4182 Element 6192825 or 6040299 ×1
  • Hinge Brick 1 x 4 [Lower] Black Part 3831 Element 383126 ×1
  • Hinge Brick 1 x 4 [Upper] Black Part 3830 Element 6344999 or 6011458 ×1
  • Hose, Classic 4mm D. 12L Black Part upn0258c12 ×4
  • Light Prism Brick, Train, 1 x 6 Holder Black Part 4170 ×2
  • Magnet Cylindrical Black Part 73092 Element 73092 ×4
  • Plate 1 x 1 Black Part 3024 Element 302426 ×2
  • Plate 1 x 2 Black Part 3023 Element 302326 ×3
  • Plate 1 x 3 Black Part 3623 Element 362326 ×4
  • Plate 1 x 4 Black Part 3710 Element 371026 ×3
  • Plate 1 x 6 Black Part 3666 Element 366626 ×2
  • Plate 2 x 2 Black Part 3022 Element 302226 ×4
  • Plate 2 x 3 Black Part 3021 Element 302126 ×3
  • Plate 2 x 4 Black Part 3020 Element 302026 ×2
  • Plate 2 x 6 Black Part 3795 Element 379526 ×4
  • Plate 2 x 8 Black Part 3034 Element 303426 ×4
  • Plate 4 x 4 Black Part 3031 Element 4243819 or 303126 ×2
  • Plate 4 x 6 Black Part 3032 Element 303226 ×1
  • Plate 4 x 8 Black Part 3035 Element 303526 ×1
  • Plate 6 x 6 Black Part 3958 Element 395826 ×1
  • Plate Special 1 x 1 with Clip Vertical [Thin Open O Clip] Black Part 4085a ×2
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Black Part 3794a ×2
  • Plate Special 1 x 2 with Handles [Round Ends, Mid Attachment] Black Part 3839a ×2
  • Plate Special 1 x 2 with Ladder Black Part 4175 Element 6285241 or 6179557 ×6
  • Technic Axle 2 Black Part 3704 Element 370426 ×2
  • Technic Brick 1 x 2 [1 Pin Hole] Black Part 3700 Element 370026 ×9
  • Technic Brick 1 x 4 [3 Pin Holes] Black Part 3701 Element 370126 ×2
  • Technic Plate 2 x 8 [7 Holes] Black Part 3738 Element 373826 ×2
  • Tile 1 x 8 with Groove Black Part 4162 Element 416226 ×2
  • Tile 2 x 2 with Groove Black Part 3068b Element 306826 ×2
  • Train Coupling Black Part 4023 ×4
  • Train, Steam Engine Cylinder, 1 x 2 Studs, Round Surfaces Black Part upn0256 ×2
  • Window 1 x 1 x 2, Short Lip [no Glass] Black Part 29 ×4
  • Window 1 x 2 x 2 Classic, Short Lip [with Glass] Black Part 3081c01 ×2

Red 67 pieces

  • Brick 1 x 3 Red Part 3622 Element 362221 ×2
  • Brick 1 x 4 Red Part 3010 Element 301021 ×6
  • Brick 1 x 8 Red Part 3008 Element 300821 ×2
  • Brick 2 x 4 without Cross Supports Red Part 3001a ×4
  • Brick Round 1 x 1 Solid Stud Red Part 3062a ×2
  • Brick Round Corner 2 x 2 Macaroni with Stud Notch Red Part 3063b Element 306321 ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Red Part 3660 Element 366021 ×2
  • Motor, Train Base, 12V Modern Type I with 2 round contact holes Red Part 501a ×1
  • Plate 1 x 2 Red Part 3023 Element 302321 ×2
  • Plate 1 x 4 Red Part 3710 Element 371021 ×4
  • Plate 1 x 6 Red Part 3666 Element 366621 ×3
  • Plate 2 x 2 Red Part 3022 Element 4613974 or 302221 ×4
  • Plate 2 x 4 Red Part 3020 Element 302021 ×3
  • Plate 2 x 6 Red Part 3795 Element 379521 ×3
  • Plate 2 x 8 Red Part 3034 Element 303421 ×3
  • Plate 6 x 8 Red Part 3036 Element 303671 or 303621 ×1
  • Plate Special 1 x 2 with Ladder Red Part 4175 Element 6285246 or 6179575 ×2
  • Tile 1 x 2 with Groove Red Part 3069b Element 4178178 or 306921 ×4
  • Tile 2 x 2 with Groove Red Part 3068b Element 306821 ×5
  • Tile Special 6 x 4 with Beveled Edges and 7mm Pin (Train Bogie Plate) Red Part 4092 ×2
  • Train Buffer Beam Red Part 4022 Element 402271 ×4
  • Wheel Train for 12V Electric Motor Red Part 867 ×2
  • Wheels Train Spoked Large (29mm D.) and Black Brick, Modified 2 x 4 [Red] Red Part 4180c05 ×4

Light Gray 14 pieces

  • Technic Axle and Pin Connector Light Gray Part 3651 Element 4105243 or 365102 ×2
  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 ×2
  • Technic Pin without Friction Ridges Lengthwise Light Gray Part 3673 Element 4184166 or 367302 ×2
  • Tyre for Train Wheel for Electric Train Motor 12V Light Gray Part 458 ×6
  • Wire with 1-Prong Connectors, 12V / 4.5V 15L Light Gray Part 765c15 ×1
  • Wire with 1-Prong Connectors, 12V / 4.5V 28L Light Gray Part 765c28 ×1

Trans-Clear 7 pieces

  • Glass for Train Door Lip On Top and Bottom Trans-Clear Part 4183 Element 418340 ×2
  • Light Prism, Train, 1 x 3 Trans-Clear Part 4171 ×4
  • Plate Round 1 x 1 with Solid Stud Trans-Clear Part 6141 Element 6514052 or 6240030 ×1

Trans-Red 2 pieces

  • Plate Round 1 x 1 with Solid Stud Trans-Red Part 6141 Element 6514051 or 6208450 ×2

Trans-Yellow 2 pieces

  • Plate Round 1 x 1 with Solid Stud Trans-Yellow Part 6141 Element 6514056 or 6240216 ×2

White 2 pieces

  • Light Brick 2 x 2 Type 1 12V (Complete) White Part 266ac01 ×2

Dark Gray 1 piece

  • Equipment Shovel [Rounded Handle End] Dark Gray Part 3837 Element 383727 ×1

[No Color/Any Color] 1 piece

  • Sticker Sheet for Set 7750-1 [No Color/Any Color] Part 191925 Element 191925 ×1

Minifigures 2 figures

  • Man, Blue Shirt, Blue Legs, Red Hard Hat Minifigure, checked as a whole figure ×1
  • 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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