Diesel Locomotive (723-1) is a 12V LEGO set released in 1970 with 96 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 25 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
1970 (56 years ago — may be retired)
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Catalog scale
96 parts listed · 25 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.)
~212 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
25 parts · updating…
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Brick 1 x 13005 · ×12 · Red -
Brick 1 x 13005 · ×8 · Trans-Clear -
Brick 1 x 23004 · ×4 · Black -
Brick 1 x 23004 · ×4 · Trans-Clear -
Brick 1 x 43010 · ×4 · Red -
Brick 1 x 63009 · ×2 · Red -
Brick 1 x 8 with Gold '723' Print3008pr0006 · ×2 · Red -
Brick 2 x 2 without Inside Ridges3003a · ×1 · Red -
Brick 2 x 3 without Cross Supports3002a · ×4 · Black -
Brick 2 x 3 without Cross Supports3002a · ×4 · Red -
Brick 2 x 4 without Cross Supports3001a · ×1 · Red -
Brick 2 x 4, 12V with Power Pickups for Train Motor and Solid Pins433c01 · ×2 · Black -
Brick Sloped 45° 2 x 23039 · ×1 · Red -
Motor, Train, 12V 12 x 4 x 3 1/3 Type I with Two Side Holesupn0274c02 · ×1 · Black -
Plate 1 x 23023 · ×16 · Yellow -
Plate 1 x 23023 · ×10 · Red -
Plate 2 x 23022 · ×1 · Red -
Plate 2 x 43020 · ×2 · Red -
Plate 2 x 83034 · ×5 · Black -
Plate Special 2 x 4 with Train Coupler Open with Magnet Short Cylinder Blue737ac02 · ×1 · Red -
Plate Special 2 x 4 with Train Coupler Open with Magnet Short Cylinder Red737ac01 · ×1 · Red -
Plate Special 6 x 16 with Motor Opening Wide3058b · ×1 · Black -
![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 Wheel Spoked for Motorupn0383a · ×4 · Red -
Tyre for Train Wheel for Electric Train Motor 12V458 · ×4 · Black