How many pieces are in the Steam Locomotive?

Steam Locomotive contains 126 pieces.

When was the Steam Locomotive released?

Steam Locomotive was released in 1969.

🏛 12V

Set #721

Steam Locomotive

The Steam Locomotive (721-1) is a charming piece of LEGO history.

Before you buy

Who it's for: Beginner build Ideal for vintage LEGO collectors and train enthusiasts of all ages.
Build: 126 pieces · about 1.5 hours Build time is an estimate.
Price: $11.50 list price · 9.1¢ per piece
Availability: Likely retired

★★★★☆ 4.2 AI-generated review score, not a customer rating

Collectors appreciate this set as a classic example of early LEGO trains, praising its simple design and historical significance. However, some find the price prohibitive and the building experience too basic compared to modern train sets.

$11.50

Best Price

$10.35

You Save

10% OFF

📝 Our Take

AI-assisted editorial summary, grounded in our LEGO database and public community discussions. How we use AI

The Steam Locomotive (721-1) is a charming piece of LEGO history. Released in 1969 as part of the 12V train system, it represents an early foray into motorized LEGO trains and holds a special place in the hearts of vintage LEGO enthusiasts.

This set is perfect for LEGO train collectors and those interested in the history of LEGO. The simple build is a quick, enjoyable experience, and the set serves as a great display piece, showcasing LEGO's early train designs.

Skip this if you are looking for modern, highly detailed train models. Consider newer LEGO train sets with more advanced features and greater detail, such as the Emerald Night (10194) or the Crocodile Locomotive (10277).

✨ New

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What is the significance of the 12V train system in LEGO history? How does the building experience of this set compare to modern LEGO train sets? What are the key factors that influence the value of vintage LEGO sets like this one? How can I best display and preserve this set to maintain its value?

🧱 Building Experience

AI-assisted build estimate, grounded in our LEGO database and public community discussions. How we use AI

🧩

126

Pieces

⏱

1.5h

Estimated Build Time

📊

Beginner

Difficulty

Build Highlights:

Simple and straightforward build, reflecting the design principles of the late 1960s
Introduction to the 12V train system and its unique motorization
Classic red and black color scheme
Opportunity to appreciate the evolution of LEGO train designs

📈 Investment Analysis

AI-assisted investment analysis, grounded in our LEGO database and public community discussions. How we use AI

↑ Trending up since release

Investment Grade

⏳ Retired

The Steam Locomotive (721-1) holds significant investment potential due to its age, rarity, and historical importance within the LEGO train theme. As a set from the early days of LEGO trains, it's highly sought after by collectors, particularly those interested in vintage LEGO. The rising price trend indicates strong demand. However, its value is highly dependent on condition, completeness, and the presence of original packaging and instructions. While the current price is high, its historical significance and limited availability suggest it could continue to appreciate, but potential investors should carefully assess the set's condition before purchasing.

Not Financial Advice: Content is for educational purposes only. Past performance doesn't guarantee future results. Full disclaimer

⚖ Compare Similar Sets

Emerald Night

Model Trains • 1,085 pcs

$99.99

Crocodile Locomotive

Model Trains • 1,271 pcs

$99.99

High-Speed City Express Passenger Train

12V • 786 pcs

$250.00

Compared to modern LEGO train sets, the Steam Locomotive (721-1) is much simpler in design and functionality. Sets like the Emerald Night (10194) or the Horizon Express (10233) offer far greater detail and more advanced building techniques. However, the 721-1 stands out for its historical importance and vintage charm. Collectors interested in the evolution of LEGO trains may prefer this set over newer, more elaborate models.

📦 Parts Inventory

Official piece count: 126
Parts cataloged in this inventory: 24 unique parts, 115 pieces

LEGO counts 126 pieces. This inventory comes from a separate parts catalog and lists 115; the two do not always count the same elements, so their totals differ. Spare parts are counted in neither figure.

Missing a piece? Check this set piece by piece, with look-alike colors flagged and element IDs for replacements.

Screwdriver with ...

Part #: 299 1× Metal

Brick 2 x 4 witho...

Part #: 3001a 2× Black

Brick 2 x 2 witho...

Part #: 3003a 1× Black

Brick 1 x 2

Part #: 3004 9× Black

Brick 1 x 1

Part #: 3005 6× Black

Brick 1 x 1

Part #: 3005 2× Trans-Clear

Brick 1 x 8

Part #: 3008 2× Black

Brick 1 x 8 with ...

Part #: 3008pr0013 2× Black

Brick 1 x 6

Part #: 3009 3× Black

Brick 1 x 4

Part #: 3010 8× Black

Plate 2 x 4

Part #: 3020 3× Red

Plate 2 x 4

Part #: 3020 8× Black

Plate 2 x 3

Part #: 3021 6× Red

Plate 2 x 3

Part #: 3021 5× Black

Plate 2 x 2

Part #: 3022 1× Yellow

Plate 2 x 2

Part #: 3022 4× Black

Part #: 3023 3× Black

Vehicle Base, Tra...

Part #: 303 1× Light Gray

Brick Sloped 45° ...

Part #: 3037 8× Black

Brick Sloped 45° ...

Part #: 3039 1× Black

Brick Sloped 45° ...

Part #: 3040a 2× Black

Brick Round 1 x 1...

Part #: 3062a 5× Black

Window 1 x 1 x 1 ...

Part #: 3087bc01 2× Red

Brick 2 x 4, 12V ...

Part #: 433c01 2× Black

Tyre for Train Wh...

Part #: 458 4× Light Gray

Motor, Train, 12V...

Part #: upn0274c02 1× Black

Train Wheel Spoke...

Part #: upn0383a 8× Red

🧱 Train Brick 2 x 4...

Part #: upn0184 2× Black

The set contains a good selection of basic bricks and plates in black and red, useful for general building and MOCs. The spoked train wheels and 12V motor components are particularly valuable for train enthusiasts.

🛒 Where to Buy

eBay

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Walmart

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$10.93

Target

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$11.50

💎 Notable Parts

Red Train Wheel Spoked for Motor (8x) $2.00

Black Brick 1 x 2 (9x) $0.45

Black Brick 1 x 4 (8x) $0.40

Black Slope 45° 2 x 4 (8x) $0.80

Light Gray Tyre for Train Wheel for Electric Train Motor 12V (4x) $1.00

Est. BrickLink Part Value

$4.65

💡 MOC Potential

🚗 Variations on the steam locomotive design, such as different wheel arrangements or cab styles

🏙 Create a vintage-style train station or railway scene to complement the locomotive

🚗 Convert to a different type of train car, like a passenger car or freight wagon

Community Insights

Real opinions from Reddit and YouTube

What Reddit Says

No Reddit discussions found for this set.

What YouTubers Say

1 video found

BlockTalk AI

The BricksNerd review of the Kai Fighter 721-1 details the set's contents, including 196 pieces and two minifigures (General Kryptor and Kai). The reviewer notes the set's approximate $20 US price point.