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.
534 pieces in 155 part and color combinations, plus 3 minifigures.
LEGO counts 544 pieces. This inventory comes from a separate parts catalog and lists 547, including the 13 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.
Panel 1 x 2 x 1 [Square Corners]Dark Gray ×4Trans-Brown ×2Trans-Brown is see-through: hold the piece up to a light.
Brick 1 x 2RedPart 3004Element 4613961 or 300421×4
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)RedPart 4032aElement 403221×3
Windscreen 5 x 2 x 1 2/3RedPart 6070Element 4200616×8
White
9 pieces
Brick Round 2 x 2 with Axle HoleWhitePart 3941Element 6601920 or 614351×3
Light Brick 1 x 2 with Single Side LightWhitePart 6035Element 4603220 or 74880×1
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)WhitePart 4032aElement 6601914 or 403201×3
Tile 1 x 4 with 4 Red Stripes PrintWhitePart 2431pr0020Element 4201629×2
Brown
6 pieces
Brick Round 1 x 1 Open StudBrownPart 3062bElement 4107810×6
Trans-Brown
6 pieces
Glass for Train Door Lip On Top and BottomTrans-BrownPart 4183Element 6040301 or 4195802×2
Glass for Window 1 x 2 x 2 PlaneTrans-BrownPart 4862Element 4188565 or 4174435×1
Panel 1 x 2 x 1 [Square Corners]Trans-BrownPart 4865aElement 4200798Also in Dark Gray×2
Windscreen 2 x 4 x 2Trans-BrownPart 3823Element 6253684 or 4167504×1
Tan
4 pieces
Plate 1 x 4TanPart 3710Element 4113233 or 371005×2
Plate 4 x 6TanPart 3032Element 4114001×2
Chrome Gold
3 pieces
Tile 1 x 2 with GrooveChrome GoldPart 3069bElement 4193065×3
Trans-Red
3 pieces
Light Prism, Train, 1 x 4Trans-RedPart 2919Element 4195779×1
Plate Round 1 x 1 with Solid StudTrans-RedPart 6141Element 6514051 or 62084501 spare in the box×2
Trans-Yellow
3 pieces
Light Prism, Train, 1 x 4Trans-YellowPart 2919Element 4124389 or 291944×1
Plate Round 1 x 1 with Solid StudTrans-YellowPart 6141Element 6514056 or 62402161 spare in the box×2
[No Color/Any Color]
1 piece
Sticker Sheet for Set 4512-1[No Color/Any Color]Part 47044Element 4201639×1
Minifigures
3 figures
Worker - Orange Safety Vest, Blue Legs, Red Helmet, Stubble BeardMinifigure, checked as a whole figure×1
Worker - Orange Safety Vest, Blue Legs, Red Helmet, Black MoustacheMinifigure, checked as a whole figure×1
Train Machinist - White Torso, Blue Overall, Blue Hat, Red ScarfMinifigure, 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.