Steam Locomotive (721-1) is a 12V LEGO set released in 1969 with 115 pieces. Browse the parts list, minifigures, and verify loose bricks with our free scanner. Collectors browsing 12V sets use this inventory to verify loose parts, compare color variants, and read official build manuals without downloading PDFs. This set includes 30 unique part types.
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Buying checklist
Quick context before you buy this set used or verify a marketplace listing.
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Release year
1969 (57 years ago — may be retired)
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Catalog scale
115 parts listed · 30 inventory lines tracked
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Minifigures
No minifigs in inventory (brick-only or Technic set)
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Build manual
No digital manual in our catalog — check the box tab or LEGO.com
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Gray era
Pre-2004 set — may use old light/dark gray instead of bluish gray
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Shipping weight (est.)
~255 g for parts inventory (excludes box/minifig packaging)
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Before you buy used
Run the completion checker, compare photos to the inventory, and check live listings for sealed pricing
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Market value
No estimate on BrickID yet
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Parts in this set
30 parts · updating…
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Brick 1 x 13005 · ×2 · Trans-Clear -
Brick 1 x 13005 · ×6 · Black -
Brick 1 x 23004 · ×9 · Black -
Brick 1 x 43010 · ×8 · Black -
Brick 1 x 63009 · ×3 · Black -
Brick 1 x 83008 · ×2 · Black -
Brick 1 x 8 with Gold '721' Print3008pr0013 · ×2 · Black -
Brick 2 x 2 without Inside Ridges3003a · ×1 · Black -
Brick 2 x 4 without Cross Supports3001a · ×2 · Black -
Brick 2 x 4, 12V with Power Pickups for Train Motor and Solid Pins433c01 · ×2 · Black -
Brick Round 1 x 1 Solid Stud3062a · ×5 · Black -
Brick Sloped 45° 2 x 1 without Bottom Pin3040a · ×2 · Black -
Brick Sloped 45° 2 x 23039 · ×1 · Black -
Brick Sloped 45° 2 x 43037 · ×8 · Black -
Motor, Train, 12V 12 x 4 x 3 1/3 Type I with Two Side Holesupn0274c02 · ×1 · Black -
Plate 1 x 23023 · ×12 · Red -
Plate 1 x 23023 · ×3 · Black -
Plate 2 x 23022 · ×1 · Red -
Plate 2 x 23022 · ×1 · Yellow -
Plate 2 x 23022 · ×4 · Black -
Plate 2 x 33021 · ×6 · Red -
Plate 2 x 33021 · ×5 · Black -
Plate 2 x 43020 · ×8 · Black -
Plate 2 x 43020 · ×3 · Red -
![Screwdriver with Old LEGO Logo [Metal]](https://cdn.rebrickable.com/media/parts/photos/9999/299-9999-5a939dd6-aa95-4d3d-8cf1-04064d613564.jpg)
Screwdriver with Old LEGO Logo [Metal]299 · ×1 · Metal -
Train Brick 2 x 4 x 1 1/3 Sliding Wheel Block - Type Aupn0184 · ×2 · Black -
Train Wheel Spoked for Motorupn0383a · ×8 · Red -
Tyre for Train Wheel for Electric Train Motor 12V458 · ×4 · Light Gray -
Vehicle Base, Train 6 x 22 Type 1 Motor Opening303 · ×1 · Light Gray -
![Window 1 x 1 x 1 Classic with Long Sill [Complete]](https://cdn.rebrickable.com/media/parts/ldraw/4/3087bc01.png)
Window 1 x 1 x 1 Classic with Long Sill [Complete]3087bc01 · ×2 · Red