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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.

Holiday Train

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10173 Holiday Train

940 pieces in 183 part and color combinations, plus 7 minifigures.

LEGO counts 965 pieces. This inventory comes from a separate parts catalog and lists 969, including the 29 parts inside the minifigures; 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.

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 379 pieces

  • Antenna 1 x 4 with Rounded Top Black Part 3957a ×7
  • Bar 1 x 8 with Brick 1 x 2 Curved Top End (Axle Holder Inside Small End) Black Part 30359b Element 4164067 ×2
  • Bar 7 x 3 with Double Clips (Ladder) [Straight Clips] Black Part 6020 Element 602026 ×1
  • Bracket 1 x 2 - 1 x 4 [Square Corners] Black Part 2436 Element 4282746 or 243626 ×2
  • Brick 1 x 2 Black Part 3004 Element 300426 ×8
  • Brick 1 x 4 Black Part 3010 Element 301026 ×1
  • Brick 1 x 6 Black Part 3009 Element 300926 ×8
  • Brick 2 x 3 Black Part 3002 Element 300226 ×1
  • Brick 2 x 4 Black Part 3001 Element 300126 ×1
  • Brick Curved 1 x 2 x 1 1/3 with Curved Top Black Part 6091 Element 6383142 or 6184784 ×4
  • Brick Curved 3 x 1 No Studs Black Part 50950 Element 4251161 ×14
  • Brick Round 1 x 1 Open Stud Black Part 3062b Element 306226 ×6
  • Brick Round 2 x 2 Dome Top, Blocked Open Stud, Bottom Axle Holder Black Part 30367b Element 4158779 ×1
  • Brick Round 2 x 2 with Axle Hole Black Part 3941 Element 614376 or 614326 ×1
  • Brick Sloped 33° 3 x 4 Black Part 3297 Element 6435854 or 329726 ×22
  • Brick Sloped 45° 2 x 2 Black Part 3039 Element 303926 ×2
  • Brick Sloped 75° 2 x 1 x 3 with Open Stud Black Part 4460a ×2
  • Brick Sloped Inverted 45° 2 x 1 Black Part 3665 Element 366526 ×10
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Black Part 3660 Element 366026 ×8
  • Brick Sloped Inverted 45° 6 x 4 Double with Recessed Center Black Part 30183 Element 4144513 or 4118888 ×3
  • Brick Sloped Inverted 75° 2 x 1 x 3 Black Part 2449 Element 4636202 or 4561789 ×2
  • Brick Special 1 x 1 with Handle Black Part 2921 Element 6170566 or 292126 ×8
  • Brick Special 1 x 1 with Headlight Black Part 4070 Element 407026 ×17
  • Brick Special 1 x 2 with Vertical Clip [Thick U Clip] Black Part 30237a ×2
  • Cone 1 x 1 [No Top Groove] Black Part 4589 Element 4518219 or 458926 ×2
  • Dish 4 x 4 Inverted [Radar] Black Part 3960 Element 396026 ×1
  • Fence Spindled 1 x 4 x 2 [2 Top Studs] Black Part 30055 Element 4185652 or 3005526 ×4
  • Flag 2 x 2 Square [Thin Clips] Black Part 2335 Element 4523405 or 233526 ×1
  • Magnet Cylindrical Black Part 73092 Element 73092 ×12
  • Panel 1 x 2 x 2 [Hollow Studs] Black Part 4864b Element 486426 ×2
  • Plate 1 x 10 Black Part 4477 Element 447726 ×2
  • Plate 1 x 2 Black Part 3023 Element 302326 ×8
  • Plate 1 x 3 Black Part 3623 Element 362326 ×2
  • Plate 1 x 4 Black Part 3710 Element 371026 ×7
  • Plate 1 x 6 Black Part 3666 Element 366626 ×4
  • Plate 1 x 8 Black Part 3460 Element 346026 ×4
  • Plate 2 x 12 Black Part 2445 Element 244526 ×2
  • Plate 2 x 2 Corner Black Part 2420 Element 242026 ×2
  • Plate 2 x 4 Black Part 3020 Element 302026 ×8
  • Plate 2 x 6 Black Part 3795 Element 379526 ×1
  • Plate 2 x 8 Black Part 3034 Element 303426 ×1
  • Plate 4 x 12 Black Part 3029 Element 302926 ×1
  • Plate 4 x 6 Black Part 3032 Element 303226 ×4
  • Plate 4 x 8 Black Part 3035 Element 303526 ×2
  • Plate Round 1 x 1 with Solid Stud Black Part 6141 Element 614126 1 spare in the box ×2
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Black Part 4032a Element 403226 ×1
  • Plate Special 1 x 1 with Clip Horizontal [Thick U Clip] Black Part 6019 Element 601976 or 601926 ×1
  • Plate Special 1 x 1 with Clip Vertical [Thick U Clip] Black Part 4085c Element 408526 ×16
  • Plate Special 1 x 2 Side Handle [Free Ends] Black Part 2540 Element 4140588 or 254026 ×5
  • Plate Special 1 x 2 with Door Rail Black Part 32028 Element 4107761 ×14
  • Plate Special 1 x 2 with Ladder Black Part 4175 Element 6285241 or 6179557 ×20
  • Plate Special 1 x 8 with Door Rail Black Part 4510 Element 4286009 or 451026 ×10
  • Seat / Chair 2 x 2 Black Part 4079 ×4
  • Steering Wheel Small, 2 x 2 Black Part 30663 Element 4153044 ×2
  • Tile 1 x 4 with Groove Black Part 2431 Element 243126 ×2
  • Tile Special 1 x 2 Grille with Bottom Groove Black Part 2412b Element 241226 ×4
  • Tile Special 1 x 2 with Handle Black Part 2432 Element 243226 ×4
  • Tile Special 6 x 4 with Beveled Edges and 5mm Pin (Train Bogie Plate) Black Part 4025 Element 6096842 or 6051914 ×4
  • Train Buffer Beam Black Part 4022 Element 4109853 or 402276 ×12
  • Train Coupling New Black Part 2920 Element 4299239 or 292076 ×12
  • Train Wheel RC Train Black Part 57878 Element 4496343 ×36
  • Tyre 21 x 12 with Offset Tread Small Wide Black Part 6015 Element 601526 ×3
  • Wheel Holder, Train Wheel RC Train Black Part 2878 Element 4207399 or 287876 ×18
  • Wheel Skateboard / Trolley Black Part 2496 Element 6223673 or 4569104 ×2
  • Window 1 x 2 x 2 Plane, Solid Studs Black Part 2377 Element 237726 ×4

White 188 pieces

  • Animal, Cat, Kitten Crouching with Black Eyes, Eyelashes, and Nose Print White Part 6251pr0002 Element 4285963 or 4220955 ×1
  • Animal, Rabbit, Standing with Eyes and Nose Print White Part 33207pr0001 Element 4247245 or 4119480 ×1
  • Antenna 1 x 4 with Rounded Top White Part 3957a ×4
  • Brick 1 x 10 White Part 6111 Element 6619291 or 611101 ×4
  • Brick 1 x 2 White Part 3004 Element 6548257 or 4613964 ×12
  • Brick 1 x 4 White Part 3010 Element 6550135 or 301001 ×6
  • Brick 1 x 8 White Part 3008 Element 6550134 or 300801 ×6
  • Brick Curved 6 x 1 White Part 42022 Element 4160387 ×4
  • Brick Round 1 x 1 Open Stud White Part 3062b Element 6619283 or 306201 ×4
  • Brick Sloped 45° 2 x 1 with Bottom Pin White Part 3040b Element 6552115 or 4121932 ×4
  • Brick Sloped 75° 2 x 1 x 3 with Open Stud White Part 4460a ×4
  • Brick Special 1 x 1 with Handle White Part 2921 Element 6615537 or 6170567 ×28
  • Brick Special 1 x 4 with 4 Studs on One Side White Part 30414 Element 6550167 or 4143254 ×8
  • Door 1 x 4 x 5 with 4 Panes, Squared Base White Part 3861b Element 4160992 or 386101 ×2
  • Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 ×7
  • Plate 1 x 4 White Part 3710 Element 6552108 or 6548266 ×6
  • Plate 1 x 6 White Part 3666 Element 6552107 or 6548265 ×2
  • Plate 1 x 8 White Part 3460 Element 6550141 or 346001 ×6
  • Plate 2 x 10 White Part 3832 Element 6552109 or 383201 ×2
  • Plate 2 x 12 White Part 2445 Element 6552091 or 244501 ×2
  • Plate 2 x 2 White Part 3022 Element 6552099 or 6548260 ×4
  • Plate 2 x 2 Corner White Part 2420 Element 6548254 or 242051 ×2
  • Plate 2 x 4 White Part 3020 Element 6552098 or 302001 ×5
  • Plate 2 x 6 White Part 3795 Element 6550146 or 379501 ×6
  • Plate Round 1 x 1 with Solid Stud White Part 6141 Element 6601919 or 614101 1 spare in the box Also in Trans-Clear ×4
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) White Part 4032a Element 6601914 or 403201 ×1
  • Plate Special 1 x 1 with Clip Vertical [Thick U Clip] White Part 4085c Element 408501 ×4
  • Plate Special 1 x 2 Side Handle [Free Ends] White Part 2540 Element 4140583 or 254051 ×1
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) White Part 3794a ×2
  • Plate Special 1 x 2 with Bar Up [Horizontal Arm 6mm] White Part 4623 Element 462301 ×1
  • Tile 1 x 2 with Letter with Script and Seal Print White Part 3069bpr0055 Element 4119410 ×8
  • Tile 1 x 4 with Groove White Part 2431 Element 6548255 or 243101 ×2
  • Tile 1 x 8 with Groove White Part 4162 Element 6552110 or 416201 ×8
  • Tile Special 1 x 1 with Clip and Straight Tips White Part 2555 Element 255501 ×2
  • Tile Special 1 x 2 Grille with Bottom Groove White Part 2412b Element 6601902 or 241201 ×9
  • Window 1 x 2 x 2 Plane, Solid Studs White Part 2377 Element 4194517 or 237701 ×4
  • Window 1 x 4 x 3 Train with Shutter Holes and Solid Studs on Ends White Part 6556 Element 4561803 or 4496377 ×12

Red 106 pieces

  • Bar 6.6L with Stop Ring [Umbrella Stand] Red Part 4095 Element 4143125 or 409571 ×12
  • Book 2 x 3 [Plain] Red Part 33009 Element 4160381 or 4111962 ×1
  • Brick 1 x 2 Red Part 3004 Element 4613961 or 300421 ×2
  • Brick 2 x 8 Red Part 3007 Element 6036408 or 300721 ×1
  • Brick Sloped 45° 2 x 1 with Bottom Pin Red Part 3040b Element 4121934 or 304021 ×4
  • Brick Special 1 x 1 with Handle Red Part 2921 Element 6170565 or 292121 ×4
  • Plant, Flower - Small Red Part 3742 1 spare in the box ×3
  • Plate 1 x 1 Red Part 3024 Element 302421 ×2
  • Plate 1 x 10 Red Part 4477 Element 447721 ×2
  • Plate 1 x 2 Red Part 3023 Element 302321 2 spares in the box ×27
  • Plate 1 x 4 Red Part 3710 Element 371021 ×2
  • Plate 1 x 6 Red Part 3666 Element 366621 ×4
  • Plate 1 x 8 Red Part 3460 Element 346021 ×2
  • Plate 2 x 12 Red Part 2445 Element 4255035 or 4161545 ×1
  • Plate 2 x 2 Corner Red Part 2420 Element 242071 or 242021 ×2
  • Plate 2 x 3 Red Part 3021 Element 302121 1 spare in the box ×3
  • Plate 2 x 6 Red Part 3795 Element 379521 ×1
  • Plate 4 x 4 Red Part 3031 Element 4243814 or 303121 ×1
  • Plate 4 x 6 Red Part 3032 Element 303221 ×1
  • Plate 6 x 6 Red Part 3958 Element 4144302 ×3
  • Plate 6 x 8 Red Part 3036 Element 303671 or 303621 ×4
  • Plate Special 1 x 1 with Clip Vertical [Thick U Clip] Red Part 4085c Element 408521 ×12
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Red Part 3794a ×3
  • Technic Brick 1 x 2 [1 Pin Hole] Red Part 3700 Element 370021 ×1
  • Tile 1 x 2 with Groove Red Part 3069b Element 4178178 or 306921 ×4
  • Tile 1 x 4 with Groove Red Part 2431 Element 243121 ×2
  • Vehicle Base, Train 6 x 28 with Two 1 x 2 Openings [3 Round Holes Each End] Red Part 4093a Element 4496500 or 409321 ×2

Green 95 pieces

  • Brick 1 x 2 Green Part 3004 Element 4107736 or 300428 ×3
  • Brick 1 x 3 Green Part 3622 Element 4109679 or 362228 ×2
  • Brick 1 x 6 Green Part 3009 Element 4111844 or 300928 ×6
  • Brick Sloped 45° 2 x 2 Green Part 3039 Element 303928 ×2
  • Brick Sloped 45° 2 x 4 Green Part 3037 Element 4141737 or 303728 ×2
  • Brick Special 1 x 2 with Grille Green Part 2877 Element 6078096 or 287728 ×22
  • Door 1 x 4 x 5 with 4 Panes, Squared Base Green Part 3861b Element 4166482 or 4106365 ×2
  • Plant, Flower Stem Green Part 3741 Element 6277589 or 374128 1 spare in the box ×2
  • Plant, Leaves 4 x 3 Green Part 2423 Element 6268814 or 242328 ×16
  • Plant, Pine Tree, Large, 4 x 4 x 6 2/3 Green Part 3471 Element 6248463 or 347128 ×3
  • Plate 1 x 2 Green Part 3023 Element 302328 ×18
  • Plate 1 x 4 Green Part 3710 Element 371028 ×4
  • Plate 1 x 6 Green Part 3666 Element 366628 ×4
  • Tile 1 x 2 with Groove Green Part 3069b Element 306928 ×4
  • Tile 2 x 2 with Groove Green Part 3068b Element 4107762 or 306828 ×5

Blue 29 pieces

  • Brick 2 x 2 Blue Part 3003 Element 4103589 or 300373 ×1
  • Brick 2 x 3 Blue Part 3002 Element 300223 ×1
  • Plate 1 x 2 Blue Part 3023 Element 302323 ×11
  • Plate 2 x 2 Blue Part 3022 Element 4613973 or 302223 1 spare in the box ×2
  • Plate 2 x 3 Blue Part 3021 Element 302123 ×3
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Blue Part 3794a ×1
  • Sports Skateboard with Trolley Wheel Holders Blue Part 42511 Element 4569105 or 4172695 ×1
  • Tile 1 x 2 with Groove Blue Part 3069b Element 306923 ×5
  • Tile 2 x 2 with Groove Blue Part 3068b Element 306823 ×2
  • Tricycle Body Front Fork / Handlebars Blue Part 30189 Element 4228073 or 4173849 ×1
  • Vehicle Body, Tricycle Top with Dark Bluish Gray Chassis Blue Part 30187b Element 6021195 or 4228074 ×1

Yellow 27 pieces

  • Brick 1 x 2 Yellow Part 3004 Element 4613966 or 300424 ×2
  • Cone 1 x 1 [No Top Groove] Yellow Part 4589 Element 458924 ×1
  • Plate 1 x 2 Yellow Part 3023 Element 302324 ×14
  • Plate 2 x 3 Yellow Part 3021 Element 302124 ×4
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Yellow Part 3794a 4 spares in the box ×4
  • Tile 1 x 2 with Groove Yellow Part 3069b Element 306924 ×2

Reddish Brown 23 pieces

  • Book 2 x 3 [Plain] Reddish Brown Part 33009 Element 4598334 or 4221595 ×1
  • Brick Special 1 x 2 Palisade [aka Log] Reddish Brown Part 30136 Element 4211180 ×8
  • Brick Special 1 x 4 Palisade [aka Log] Reddish Brown Part 30137 Element 4211181 ×14

Chrome Silver 18 pieces

  • Train Wheel RC Train, Metal Axle 5 x 100 LDU Chrome Silver Part 57051 Element 4298979 ×18

Trans-Clear 18 pieces

  • Glass for Train Window 1 x 4 x 3 Trans-Clear Part 4034 Element 403440 ×12
  • Glass for Window 1 x 2 x 2 Plane Trans-Clear Part 4862 Element 4174748 or 486240 ×4
  • Plate Round 1 x 1 with Solid Stud Trans-Clear Part 6141 Element 6514052 or 6240030 1 spare in the box Also in White ×2

Trans-Red 17 pieces

  • Plate Round 1 x 1 with Solid Stud Trans-Red Part 6141 Element 6514051 or 6208450 1 spare in the box ×17

Light Bluish Gray 12 pieces

  • Animal, Rodent, Rat / Mouse, Standing (Scabbers) Light Bluish Gray Part 50687 Element 4237196 ×2
  • Brick 2 x 2 Light Bluish Gray Part 3003 Element 4211387 ×5
  • Technic Pin 1/2 without Friction Ridges Light Bluish Gray Part 4274 Element 4274194 or 4211483 1 spare in the box ×1
  • Tile Round 2 x 2 with Fine Mesh Grill Print Light Bluish Gray Part 4150pr0022 Element 4221881 ×1
  • Wheel 11 x 12 with Hole Notched for Wheels Holder Pin Light Bluish Gray Part 6014b Element 4211764 ×2
  • Wheel Centre Wide with Stub Axles [Tricycle] Light Bluish Gray Part 30190 Element 4287630 or 4211768 ×1

Trans-Yellow 10 pieces

  • Plate Round 1 x 1 with Solid Stud Trans-Yellow Part 6141 Element 6514056 or 6240216 1 spare in the box ×10

Trans-Dark Blue 8 pieces

  • Plate Round 1 x 1 with Solid Stud Trans-Dark Blue Part 6141 Element 6514055 or 6240214 1 spare in the box ×8

Dark Bluish Gray 4 pieces

  • Equipment Shovel [Rounded Handle End] Dark Bluish Gray Part 3837 Element 4211006 ×1
  • Equipment Weapon, Loudhailer / Speaker / Blaster / Space Gun Dark Bluish Gray Part 4349 Element 4210698 ×2
  • Tile 1 x 4 with Train Controls Print Dark Bluish Gray Part 2431pr0028 Element 6020825 or 4215740 ×1

Dark Pink 3 pieces

  • Plant, Flower - Small Dark Pink Part 3742 1 spare in the box ×3

Bright Green 2 pieces

  • Plant, Apple Bright Green Part 33051 Element 6413063 or 4107050 ×2

Magenta 1 piece

  • Book 2 x 3 [Plain] Magenta Part 33009 Element 4243784 ×1

Minifigures 7 figures

  • Woman - Medium Blue Torso, Light Bluish Gray Legs Minifigure, checked as a whole figure ×1
  • Man - Dark Blue Plaid Torso, Light Bluish Gray Legs Minifigure, checked as a whole figure ×1
  • Man - Red Jacket, Red Legs Minifigure, checked as a whole figure ×1
  • Man - Tan Shirt, Dark Bluish Gary Legs, Black Cap Minifigure, checked as a whole figure ×1
  • Conductor - Dark Blue Jacket, Dark Blue Legs, Dark Red Hat, Glasses, Beard Minifigure, checked as a whole figure ×1
  • Train Conductor - Dark Blue Jacket, Dark Blue Legs, Dark Red Hat, Glasses (3626b head) Minifigure, checked as a whole figure ×1
  • Train Machinist - White Torso, Blue Striped Overall, Blue 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.

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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.

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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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