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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.

Intelligent Train Set

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9125 Intelligent Train Set

134 pieces in 66 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

Duplo, Quatro and Primo 126 pieces

  • Duplo Brick 2 x 2 Black Part 3437 Element 4583790 or 343726 ×2
  • Duplo Brick 2 x 2 Slope 45° Black Part 6474 Element 4168694 ×8
  • Duplo Brick 2 x 4 x 2 with 2 x 2 Square Arch with Four Yellow Stripes Print Black Part 6394pr0001 Element 4169533 ×1
  • Duplo Fence / Rail 1 x 6 with 5 Rails Black Part 2214 Element 4168693 ×2
  • Duplo Forklift Plate Black Part 42405 Element 4165974 ×1
  • Duplo Train Base 4 x 8 for Intelligent Train, with Battery Compartment Black Part 2092c01 Element 4263158 ×1
  • Duplo Train Base 4 x 8 with Pearl Light Gray Train Wheels and Moveable Hook Black Part 31507c01 ×2
  • Duplo Train Crossing Barrier / Gate Base Black Part 6405 Element 4168685 ×2
  • Duplo Winch Drum Narrow with White String and Black Thick Hook with Stud Case and Horizontal Bar Black Part 41169c04 ×1
  • Duplo Bag / Wheeled Suitcase Blue Part 42398 Element 4170037 ×1
  • Duplo Train, Intelligent Train Freight Container with Sound and Cargo Logo Print Blue Part 42400c01 Element 4206945 ×1
  • Duplo Brick 1 x 2 x 2 with Fuel Container Print Bright Green Part 4066pr0085 ×1
  • Duplo Plate 4 x 8 Bright Green Part 4672 Element 6048851 or 4279293 ×1
  • Duplo Plate 8 x 3 without Corners (Airplane Wings) Bright Green Part 2156 Element 4168696 ×1
  • Duplo Plate 6 x 12 Dark Gray Part 4196 Element 4169241 ×2
  • Duplo Train Track 4 x 8 Curved [Short] Dark Gray Part 6378 Element 637827 ×14
  • Duplo Train Track 4 x 8 Straight Dark Gray Part 6377 Element 637727 ×8
  • Duplo Train Track End with 2 x 4 Plate on One End Dark Gray Part 31442 Element 4170314 ×1
  • Duplo Train Track Switcher with 2 x 2 Studs Dark Gray Part 6379c01 Element 4169674 or 74870 ×3
  • Duplo Train Track with Ramps For Car Crossing Dark Gray Part 6391 Element 639127 ×1
  • Duplo Hose 11L with Stud Holder and Green Hose Green Part 6426c02 Element 4172546 ×1
  • Duplo Hose with Green Nozzle and Stud Holder Green Part 6425c01 Element 4157652 ×1
  • Duplo Plate 6 x 12 Medium Blue Part 4196 Element 4181963 ×2
  • Duplo Plate Special 4 x 6 with Studs on Edge Medium Blue Part 31465 Element 4181966 ×2
  • Duplo Bag / Wheeled Suitcase Medium Dark Pink Part 42398 Element 4165504 ×1
  • Duplo Brick 2 x 2 Orange Part 3437 Element 4159527 ×4
  • Duplo Crane Arm (Full Assembly) Orange Part 55436 ×1
  • Duplo Forklift Truck with Two Large Front Black Wheels and Two Small Rear Black Wheels Orange Part 42404c01 Element 4617651 or 4534373 ×1
  • Duplo Train Compartment/Container Frame Pearl Light Gray Part 31301 Element 4168690 ×1
  • Duplo Brick 1 x 2 x 2 with Chain and Hook Print Red Part 4066pr0084 Element 4169529 ×1
  • Duplo Brick 2 x 2 Red Part 3437 Element 4583321 or 343721 ×1
  • Duplo Brick 2 x 2 Slope 45° with Keypad and Display Print Red Part 6474pr9972 Element 4169542 ×1
  • Duplo Brick 2 x 2 Slope 45° with Octan, 1, 2, 3, 4 and Gas Gauge Print Red Part 6474pr9994 Element 4168320 ×1
  • Duplo Brick 2 x 2 x 2 with Vertical Grooves Red Part 41978 Element 4162960 ×8
  • Duplo Brick 2 x 4 x 2 Curved Top with Clock Print Red Part 31213pr0002 Element 4169666 ×1
  • Duplo Brick 2 x 4 x 2 Curved Top with Octan Logo Print Red Part 31213pr9996 Element 4169665 ×1
  • Duplo Chair with 4 Studs and Squared Back Red Part 6478 Element 4112066 ×2
  • Duplo Train Crossing Gate / Barrier, with Small Handle and White Stripes Red Part 6406b Element 4143223 ×2
  • Duplo Train, Intelligent Train Freight Container with Sound and Cargo Logo Print Red Part 42400c03 ×1
  • Duplo Train Passenger Car Canopy Trans-Brown Part 42406 Element 4168639 ×1
  • Duplo Train, Intelligent Train Engine Canopy Trans-Brown Part 42359 ×1
  • Duplo Train Intelligent Train Smart Tile with Horn Print Trans-Dark Pink Part 42388 Element 4165527 or 4165507 ×1
  • Duplo Brick 2 x 2 Trans-Green Part 3437 Element 4168695 ×1
  • Duplo Train Intelligent Train Smart Tile with Octan Logo Print Trans-Green Part 42394 Element 4165535 or 4165514 ×1
  • Duplo Train Intelligent Train Smart Tile with Reverse Arrow Print Trans-Light Blue Part 42387 Element 4165526 or 4165506 ×1
  • Duplo Train Intelligent Train Smart Tile with Cargo Logo Print Trans-Neon Orange Part 42392 Element 4165533 or 4165512 ×1
  • Duplo Train Intelligent Train Smart Brick with Stop Sign Print Trans-Red Part 42386 Element 4165515 or 4165505 ×1
  • Duplo Brick 2 x 2 Trans-Yellow Part 3437 Element 6507901 or 6201836 ×2
  • Duplo Train Intelligent Train Smart Tile with Train Engine Print Trans-Yellow Part 42391 Element 4165530 or 4165511 ×1
  • Duplo Brick 2 x 2 White Part 3437 Element 343701 ×4
  • Duplo Brick 2 x 2 x 2 with Vertical Grooves White Part 41978 Element 4166751 ×14
  • Duplo Plate 4 x 4 with 2 x 2 x 2 Dome Top and Cross Cut Slots White Part 42058 Element 4169949 ×2
  • Duplo Water Container with Octan Logo Print White Part 75084pr0003 Element 4171911 or 4143721 ×1
  • Duplo Brick 2 x 2 x 2 with 1 x 2 Center with Double Sided Arrow Print (Train Track Switching Control) Yellow Part 6442pr0001 Element 81916 ×3
  • Duplo Train Cargo Bin Yellow Part 31303 Element 4170658 ×1
  • Duplo Train Intelligent Train Engine Base Yellow Part 6172 ×1
  • Duplo Train Passenger Car Body Yellow Part 42397 Element 4165503 ×1
  • Background, Wall with Stone Details and Door / Ticket Booth, Phone, and Train Map Print [No Color/Any Color] Part 4170201 Element 4170201 ×1

Non-Buildable Figures (Duplo, Fabuland, etc) 6 pieces

  • Duplo Figure, Early, Hard Hat Orange, Blue Legs, Shirt with Pockets / 'Cargo' on Back Print Blue Part 74506pr0001 Element 4169669 ×1
  • Duplo Figure, Early, with Short Parted Hair Black, Blue Legs, Plaid Shirt with Pocket and Collar Print Medium Blue Part 74511pr0023 Element 4167775 ×1
  • Duplo Figure, Early Child, with Pigtails Light Yellow, Orange Legs, Orange Overalls Print Medium Dark Pink Part 76045pr0006 Element 4167770 ×1
  • Duplo Figure, Early, Cap Blue, Red Legs, Jacket with Pockets with Octan Logo Print Red Part 76399pr0002 Element 4169699 ×1
  • Duplo Figure, Early, with Flat Cap Trans-Brown, Black Legs, Bandana, Pockets Print (Intelli-Train Driver) Red Part 44349pr0002 ×1
  • Duplo Figure, Early, with Flat Cap Trans-Brown, Black Legs, Bandana, Pockets Print (Intelli-Train Driver) Yellow Part 44349pr0001 Element 4165501 ×1

Gear Parts 2 pieces

  • Instructions, Duplo Train Training Manual [No Color/Any Color] Part 4185961 ×1
  • Video Tape, Duplo Trains [No Color/Any Color] Part 44944 Element 4184226 ×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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