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.
822 pieces in 222 part and color combinations, plus 4 minifigures.
The official piece count includes the 17 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.
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)White ×2Trans-Clear ×2Trans-Clear is see-through: hold the piece up to a light.
Brick 1 x 8Black ×2Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Plate 4 x 6Black ×2Dark Bluish Gray ×7Black is darker than Dark Bluish Gray.
Tile 1 x 2 with GrooveRedPart 3069bElement 4178178 or 306921×1
Tile 1 x 4 with GrooveRedPart 2431Element 243121×3
Wedge Plate 3 x 6 Cut CornersRedPart 2419Element 241921×2
Blue
36 pieces
Bracket 1 x 2 - 2 x 2BluePart 44728Element 6117968 or 6037412×2
Brick 1 x 3BluePart 3622Element 362223×2
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)BluePart 54200Element 4504380 or 42961541 spare in the box×2
Door 1 x 3 x 1 LeftBluePart 3822Element 4586544 or 382223×1
Door 1 x 3 x 1 RightBluePart 3821Element 4586547 or 4141585×1
Lever Small Base with Black LeverBluePart 298c02Element 4296152 or 41639881 spare in the box×2
Panel 1 x 2 x 1 [Rounded Corners]BluePart 4865bElement 6146218×3
Plate 1 x 4BluePart 3710Element 371023×1
Plate 2 x 4BluePart 3020Element 4240375 or 302023×12
Plate 4 x 8BluePart 3035Element 303523×1
Seat / Chair 2 x 2BluePart 4079×3
Technic Plate 1 x 5 with Smooth Ends, 4 Studs and Centre Axle HoleBluePart 32124Element 6280384 or 4112874×4
Tile 1 x 2 with GrooveBluePart 3069bElement 306923×1
Wheel Arch, Mudguard 2 x 4 Studded with HoleBluePart 60212Element 6331572 or 4600182×1
White
36 pieces
Bracket 1 x 2 - 2 x 2WhitePart 44728Element 6619296 or 6117940×2
Brick 1 x 2 x 5 with Hollow StudsWhitePart 2454bElement 6619280 or 245401×2
Brick 1 x 3WhitePart 3622Element 6550143 or 362201×2
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)WhitePart 54200Element 6550179 or 45043691 spare in the boxAlso in Trans-Clear×2
Brick Sloped 65° 2 x 1 x 2WhitePart 60481Element 6552132 or 4515370×2
Brick Wedged, Curved Triple 4 x 4 x 2/3, 2 StudsWhitePart 45677Element 4193068 or 456771×1
Cylinder Half 3 x 6 x 6 with 1 x 2 CutoutWhitePart 87926Element 6602845 or 6382974×4
Dish 6 x 6 Inverted (Radar) with Hollow StudsWhitePart 44375aElement 4182773×2
Door 1 x 3 x 1 LeftWhitePart 3822Element 4527637 or 4161547×1
Door 1 x 3 x 1 RightWhitePart 3821Element 4537987 or 4527638×1
Panel 1 x 2 x 1 [Rounded Corners]WhitePart 4865bElement 6552161 or 6146215×1
Plate 1 x 4WhitePart 3710Element 6552108 or 6548266×1
Plate 1 x 6WhitePart 3666Element 6552107 or 6548265×1
Plate 2 x 4WhitePart 3020Element 6552098 or 302001×1
Tile 1 x 2 with GrooveWhitePart 3069bElement 6548264 or 306901×3
Wheel 8 x 9 with Hole Notched for Wheels Holder PinWhitePart 30027bElement 4170500 or 3002701×8
Wheel Arch, Mudguard 2 x 4 Studded with HoleWhitePart 60212Element 4600181 or 4520807×2
Green
35 pieces
Brick 1 x 1GreenPart 3005Element 300528×8
Brick 1 x 10GreenPart 6111Element 6249998 or 4529156×6
Brick 1 x 2GreenPart 3004Element 4107736 or 300428×4
Brick 1 x 4GreenPart 3010Element 4112838 or 301028×4
Brick 2 x 6GreenPart 2456Element 4181135 or 4142867×1
Plate 1 x 4GreenPart 3710Element 371028×6
Plate 1 x 6GreenPart 3666Element 366628×2
Plate Special 1 x 2 Side Handle [Free Ends]GreenPart 2540Element 4542391 or 4519974×2
Support Crane Stand Double without Studs on Cross-Brace, with Axle Holes on TopGreenPart 92086Element 4594722×2
Chrome Silver
10 pieces
Train Wheel RC Train, Metal Axle 5 x 100 LDUChrome SilverPart 57051Element 4298979×10
Trans-Clear
10 pieces
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)Trans-ClearPart 54200Element 6245250 or 42443621 spare in the boxAlso in White×2
Glass for Windscreen 4 x 6 x 4 Cab with Hinge [Fits 45406]Trans-ClearPart 46103Element 4586583 or 4194220×2
Plate Round 1 x 1 with Solid StudTrans-ClearPart 6141Element 6514052 or 62400302 spares in the box×6
Trans-Red
10 pieces
Plate 1 x 2Trans-RedPart 3023Element 6514003 or 6240212×2
Plate Round 1 x 1 with Solid StudTrans-RedPart 6141Element 6514051 or 62084503 spares in the box×8
Trans-Yellow
9 pieces
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)Trans-YellowPart 54200Element 6245272 or 42609421 spare in the box×6
Plate 1 x 2Trans-YellowPart 3023Element 6514002 or 6240211×3
Trans-Orange
6 pieces
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)Trans-OrangePart 54200Element 6245265 or 42443691 spare in the box×2
Plate Round 1 x 1 with Solid StudTrans-OrangePart 6141Element 6514059 or 62402271 spare in the box×2
Tile 1 x 2 with GrooveTrans-OrangePart 3069bElement 6514225 or 6251306×2
Trans-Brown
5 pieces
Windscreen 2 x 6 x 2, Wide TopTrans-BrownPart 4176Element 4176111 or 4173328×1
Windscreen 3 x 4 x 1 1/3 with 2 Studs on TopTrans-BrownPart 2437Element 6507913 or 6253360×1
Windscreen 3 x 4 x 4 InvertedTrans-BrownPart 4872Element 4195864×3
Dark Tan
4 pieces
Technic Axle 3 with StudDark TanPart 6587Element 6031821 or 6013821×4
Orange
3 pieces
Technic Pin Connector Round [Slotted]OrangePart 62462Element 6173129 or 4538144×2
Tile Special 1 x 2 Grille with Bottom GrooveOrangePart 2412bElement 4125254 or 3933106×1
Trans-Light Blue
1 piece
Windscreen 3 x 4 x 1 1/3 Large Glass SurfaceTrans-Light BluePart 57783Element 6507932 or 6247360×1
[No Color/Any Color]
1 piece
Sticker Sheet for Set 7939-1[No Color/Any Color]Part 91144Element 4586574×1
Minifigures
4 figures
Worker - Orange Safety Vest, Blue Legs, Red Helmet, GlassesMinifigure, checked as a whole figure×1
Worker - Orange Safety Vest, Blue Legs, Red Helmet, Silver GlassesMinifigure, checked as a whole figure×1
Train Machinist - White Torso, Blue Overall, Blue HatMinifigure, checked as a whole figure×1
Worker - Medium Blue Torso, Blue Overall, GlassesMinifigure, 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.
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.