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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.

Freight Steam Train

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7727 Freight Steam Train

562 pieces in 124 part and color combinations, plus 2 minifigures.

The official 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.

Look-alike colors in this set

These parts appear in this set in two colors that are easy to confuse. If you are one short in one color, check whether it went in where the other color belongs. Each color has its own element ID in the parts list at the back of the instructions.

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Piece checklist

Black 257 pieces

  • Bar 1 x 4 x 2 with Studs Black Part 4083 Element 408326 ×1
  • Brick 1 x 1 Black Part 3005 Element 300526 ×10
  • Brick 1 x 2 Black Part 3004 Element 300426 ×5
  • Brick 1 x 4 Black Part 3010 Element 301026 ×1
  • Brick 1 x 8 Black Part 3008 Element 300826 ×2
  • Brick 2 x 2 without Inside Ridges Black Part 3003a ×3
  • Brick 2 x 4 Black Part 3001 Element 300126 ×1
  • Brick Round 2 x 2 with Axle Hole Black Part 3941 Element 614376 or 614326 ×2
  • Brick Sloped 33° 3 x 2 Black Part 3298 Element 329826 ×2
  • Brick Sloped 33° 6 x 6 Double (Train Roof) Black Part 4509 Element 4107859 ×1
  • Brick Sloped 45° 2 x 1 Triple with Ovoid Bottom Pin Black Part 3048c Element 304826 ×16
  • Brick Sloped 45° 2 x 1 with Bottom Pin Black Part 3040b Element 4121966 or 304026 ×6
  • Brick Sloped 45° 2 x 2 Black Part 3039 Element 303926 ×2
  • Brick Sloped 45° 2 x 3 Black Part 3038 Element 303826 ×4
  • Brick Sloped 45° 2 x 4 Black Part 3037 Element 303726 ×3
  • Brick Sloped Inverted 45° 2 x 1 Black Part 3665 Element 366526 ×26
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Black Part 3660 Element 366026 ×2
  • Brick Special 1 x 1 with Headlight Black Part 4070 Element 407026 ×6
  • 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
  • Fence Lattice 1 x 4 x 1 Black Part 3633 Element 4187209 or 363326 ×6
  • Fence Lattice 1 x 4 x 2 Black Part 3185 Element 4188953 or 4106485 ×2
  • Forklift Mast and Carriage, Wide 1 x 2 Hinge Plate and Light Gray Wide Forks [Complete Assembly] Black Part 4518ac01 ×1
  • Hinge Plate 1 x 2 with 2 Fingers and Solid Studs Black Part 4276a ×2
  • Hinge Vehicle Roof 4 x 4 Black Part 4213 Element 421326 ×1
  • Hinge Vehicle Roof Holder 1 x 4 x 2 Black Part 4214 Element 421426 ×1
  • Hose, Pneumatic 4mm D. 15L / 12cm Black Part 5102c15 ×1
  • Magnet Cylindrical Black Part 73092 Element 73092 ×8
  • Plate 1 x 1 Black Part 3024 Element 302426 ×2
  • Plate 1 x 2 Black Part 3023 Element 302326 ×21
  • Plate 1 x 4 Black Part 3710 Element 371026 ×12
  • Plate 1 x 6 Black Part 3666 Element 366626 ×15
  • Plate 2 x 10 Black Part 3832 Element 383226 ×3
  • Plate 2 x 2 Black Part 3022 Element 302226 ×10
  • Plate 2 x 6 Black Part 3795 Element 379526 ×10
  • Plate 2 x 8 Black Part 3034 Element 303426 ×1
  • Plate 4 x 4 Black Part 3031 Element 4243819 or 303126 ×2
  • Plate 6 x 16 Black Part 3027 Element 302726 ×3
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Black Part 4032a Element 403226 ×2
  • Plate Special 1 x 1 with Clip Light, Bar Hole [Thin Ring] Black Part 4081a ×2
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Black Part 3794a ×8
  • Plate Special 1 x 8 with Door Rail Black Part 4510 Element 4286009 or 451026 ×4
  • Plate Special 2 x 2 with Wheels Red Black Part 122c01 ×2
  • Technic Brick 1 x 2 [1 Pin Hole] Black Part 3700 Element 370026 ×1
  • Tile 1 x 8 with Groove Black Part 4162 Element 416226 ×4
  • Tile 2 x 2 with Groove Black Part 3068b Element 306826 ×2
  • Tile Round 2 x 2 with Bottom Cross Black Part 4150 Element 415076 or 415026 ×2
  • Train Buffer Beam Black Part 4022 Element 4109853 or 402276 ×6
  • Train Coupling Black Part 4023 ×8
  • Tyre 15 x 6 Offset Tread Small Black Part 3641 Element 4501046 or 364126 ×6
  • Tyre 21 x 8 Offset Tread Medium Black Part 4084 ×2
  • Weapon Gun / Torch (Space) [with Grooves] Black Part 3959 Element 4254942 or 395976 ×2
  • Wheels Train Spoked Small (23mm D.) and Black Brick, Modified 2 x 4 [Black] Black Part 4180c01 ×6
  • Window 1 x 2 x 2 Classic, Short Lip [with Glass] Black Part 3081c01 ×2

Light Gray 116 pieces

  • Brick Sloped 33° 3 x 4 Light Gray Part 3297 Element 329702 ×8
  • Hinge Plate 1 x 2 with 2 Fingers and Solid Studs Light Gray Part 4276a ×4
  • Hinge Plate 1 x 2 with 3 Fingers [Solid Studs] Light Gray Part 4275a ×4
  • Plate 1 x 2 Light Gray Part 3023 Element 302302 ×4
  • Plate 1 x 4 Light Gray Part 3710 Element 371002 ×12
  • Plate 2 x 4 Light Gray Part 3020 Element 302002 ×2
  • Plate 4 x 12 Light Gray Part 3029 Element 302902 ×1
  • Plate 4 x 6 Light Gray Part 3032 Element 303202 ×6
  • Plate Special 1 x 8 with Door Rail Light Gray Part 4510 Element 451002 ×4
  • Plate Special 2 x 2 with Wheels Red Light Gray Part 122c01 ×2
  • Seat / Chair 2 x 2 Light Gray Part 4079 Element 407902 ×2
  • Tile 2 x 2 with Groove Light Gray Part 3068b Element 306802 ×3
  • Train Motor 12V Connecting Rod Light Gray Part 502 ×4
  • Train Track 12V Conducting Rail Curved [Cable Connection Holes] Light Gray Part 3241 ×15
  • Train Track 12V Conducting Rail Straight Light Gray Part 3242 ×2
  • Tyre for Train Wheel for Electric Train Motor 12V Light Gray Part 458 ×6
  • Vehicle Track, Train, 12V Conducting Rail Curved with Connection Wire Light Gray Part 2731 ×1
  • Vehicle Track, Train, Slotted Rail Curved Inside Light Gray Part 3230b ×16
  • Vehicle Track, Train, Slotted Rail Curved Outside Light Gray Part 3229b ×16
  • Vehicle Track, Train, Slotted Rail Straight Light Gray Part 3228b Element 322802 ×4

Red 72 pieces

  • Brick 1 x 1 Red Part 3005 Element 300521 ×14
  • Brick 1 x 2 Red Part 3004 Element 4613961 or 300421 ×8
  • Brick 1 x 4 Red Part 3010 Element 301021 ×4
  • Brick 1 x 6 Red Part 3009 Element 300921 ×6
  • Brick Sloped Inverted 33° 3 x 2, No Connections between Studs, Ovoid Bottom Pin Red Part 3747a Element 374721 ×4
  • Door Sliding - Type 1 Red Part 4511 ×4
  • Motor, Train Base, 12V Unslotted with 3-Hole Plugs Red Part 501b ×1
  • Plate 1 x 1 Red Part 3024 Element 302421 Also in Trans-Red ×2
  • Plate 1 x 2 Red Part 3023 Element 302321 ×3
  • Plate 1 x 3 Red Part 3623 Element 362321 ×2
  • Plate 1 x 4 Red Part 3710 Element 371021 ×3
  • Plate 1 x 6 Red Part 3666 Element 366621 ×4
  • Plate 2 x 4 Red Part 3020 Element 302021 ×2
  • Plate 2 x 6 Red Part 3795 Element 379521 ×4
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Red Part 4032a Element 403221 ×1
  • Plate Special 1 x 2 with Ladder Red Part 4175 Element 6285246 or 6179575 ×2
  • Plate Special 6 x 16 with Motor Opening Wide Red Part 3058b ×1
  • Steering Stand 1 x 2 with Black Steering Wheel Red Part 3829c01 Element 9552 ×1
  • Train Buffer Beam Red Part 4022 Element 402271 ×2
  • Train, Steam Engine Cylinder, 1 x 2 Studs, Round Surfaces, Interior Grooves Red Part upn0256b ×2
  • Wheel Train for 12V Electric Motor Red Part 867 ×2

Dark Gray 36 pieces

  • Vehicle Track, Train, Sleeper Plate 2 x 8 with Cable Grooves Dark Gray Part 4166 Element 416627 ×36

Yellow 36 pieces

  • Brick 1 x 1 Yellow Part 3005 Element 300524 ×2
  • Brick 1 x 2 Yellow Part 3004 Element 4613966 or 300424 ×2
  • Brick 2 x 2 without Inside Ridges Yellow Part 3003a ×1
  • Brick Sloped 45° 2 x 2 Yellow Part 3039 Element 303924 ×1
  • Brick Sloped Inverted 45° 2 x 1 Yellow Part 3665 Element 366524 ×4
  • Brick Special 1 x 1 with Headlight Yellow Part 4070 Element 407024 ×4
  • Plate 1 x 2 Yellow Part 3023 Element 302324 ×3
  • Plate 1 x 3 Yellow Part 3623 Element 362324 ×2
  • Plate 1 x 4 Yellow Part 3710 Element 371024 ×6
  • Plate 1 x 6 Yellow Part 3666 Element 366624 ×6
  • Plate 1 x 8 Yellow Part 3460 Element 346024 ×2
  • Plate 2 x 4 Yellow Part 3020 Element 302024 ×2
  • Steering Stand 1 x 2 with Black Steering Wheel Yellow Part 3829c01 Element 9553 ×1

White 18 pieces

  • Brick 1 x 2 White Part 3004 Element 6548257 or 4613964 ×3
  • Brick 1 x 3 White Part 3622 Element 6550143 or 362201 ×2
  • Brick 1 x 4 White Part 3010 Element 6550135 or 301001 ×6
  • Brick Round 2 x 2 with Axle Hole White Part 3941 Element 6601920 or 614351 ×4
  • Window 1 x 2 x 3 Shutter White Part 3856 Element 4177767 or 385601 ×2
  • Window 1 x 4 x 3 White Part 3853 Element 4175392 or 385301 ×1

Blue 12 pieces

  • Brick Round 2 x 2 with Axle Hole Blue Part 3941 Element 614373 or 614323 ×12

Trans-Clear 8 pieces

  • Glass for Train Door Lip On Top and Bottom Trans-Clear Part 4183 Element 418340 ×2
  • Plate Round 1 x 1 with Solid Stud Trans-Clear Part 6141 Element 6514052 or 6240030 ×5
  • Windscreen 2 x 4 x 2 Trans-Clear Part 3823 Element 6581801 or 6253681 ×1

Trans-Red 4 pieces

  • Plate 1 x 1 Trans-Red Part 3024 Element 6513963 or 6252042 Also in Red ×2
  • 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

[No Color/Any Color] 1 piece

  • Sticker Sheet for Set 7727-1 [No Color/Any Color] Part 195465 ×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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