All Aboard the 4.5V!
Classic Diesel Train from 1980

Relive LEGO's electric train era with this vintage freight set. A nostalgic build for collectors and train enthusiasts.

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🏛 4.5V
Set #7720

Diesel Freight Train Set, battery

The Diesel Freight Train Set 7720-1 is a classic piece of LEGO history.

🏆 Best For: Ideal for LEGO train enthusiasts and collectors interested in a classic building experience ⏱ 4.5 hr build 🧩 428 pcs
★★★☆☆ 3.8 from 5 reviews

Fans appreciate the nostalgic value and classic design of the Diesel Freight Train Set, though some find the lack of modern features and the age of the set to be drawbacks. The vintage minifigures and train elements are praised for their historical significance.

MSRP
$69.99
Best Price
$62.99
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10% OFF
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📝 Our Take

The Diesel Freight Train Set 7720-1 is a classic piece of LEGO history. Released in 1980 as part of the 4.5V train system, this set evokes a sense of nostalgia for older LEGO fans and train enthusiasts, marking a significant era in LEGO train development.

This set is perfect for collectors interested in vintage LEGO trains and those seeking a tangible piece of LEGO history. Rebuilding and displaying this set provides a hands-on connection to LEGO's past, offering a rewarding experience for those who appreciate the evolution of LEGO trains.

Skip this if you're looking for modern train features like remote control or Power Functions. Consider newer LEGO train sets such as 60198-1 or 60336-1 for more advanced functionality and playability.

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🧱 Building Experience

🧩
428
Pieces
4.5h
Build Time
📊
Intermediate
Difficulty
Build Highlights:
  • Assembling the vintage diesel freight train
  • Constructing the classic 4.5V battery-powered system
  • Building the freight cars and accessories
  • Creating a complete train setup with tracks and scenery

📈 Investment Analysis

↑ Trending up since release
A
Investment Grade
⏳ Appreciating
The Diesel Freight Train Set 7720-1 holds strong investment potential due to its age, rarity, and the enduring popularity of LEGO trains. As a vintage set from 1980, it is highly sought after by collectors, driving up its value on the secondary market. The rising price trend indicates increasing demand, making it a promising addition to any LEGO investment portfolio. However, potential investors should be aware of the set's age and condition, as these factors can significantly impact its value. Compared to modern sets, the 7720-1 offers a unique historical appeal that sets it apart, potentially yielding substantial returns for those who acquire and maintain it in good condition.

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

Compare Similar Sets

Compared to modern LEGO train sets like 60198-1 or 60336-1, the Diesel Freight Train Set 7720-1 offers a vintage building experience and a piece of LEGO history. While newer sets feature remote control and advanced functionality, the 7720-1 provides a nostalgic charm and a unique collectible value. Collectors interested in the evolution of LEGO trains may prefer the 7720-1 for its historical significance, while those seeking modern features may opt for the newer sets.

3 Minifigures Included

The set includes three classic LEGO minifigures, each with a simple design and red headwear, typical of LEGO figures from the 1980s. These figures add to the set's vintage charm and collectible value.

📦 Full Parts Inventory - 79 unique parts • 416 total pieces

Plate Special 2 x 2 with Wheels Red Plate Special 2 x...
Part #: 122c01 Black
Brick 2 x 4 Brick 2 x 4
Part #: 3001 Black
Brick 2 x 2 without Inside Ridges Brick 2 x 2 witho...
Part #: 3003a Red
Brick 1 x 2 Brick 1 x 2
Part #: 3004 Red
Brick 1 x 2 Brick 1 x 2
Part #: 3004 11× Yellow
Brick 1 x 2 Brick 1 x 2
Part #: 3004 Black
Brick 1 x 2 Brick 1 x 2
Part #: 3004 Blue
Brick 1 x 1 Brick 1 x 1
Part #: 3005 Yellow
Brick 1 x 1 Brick 1 x 1
Part #: 3005 14× Red
Brick 1 x 6 Brick 1 x 6
Part #: 3009 Black
Brick 1 x 6 Brick 1 x 6
Part #: 3009 Yellow
Brick 1 x 4 Brick 1 x 4
Part #: 3010 Yellow
Brick 1 x 4 Brick 1 x 4
Part #: 3010 Red
Brick 1 x 4 Brick 1 x 4
Part #: 3010 Black
Plate 2 x 4 Plate 2 x 4
Part #: 3020 Yellow
Plate 2 x 3 Plate 2 x 3
Part #: 3021 Yellow
Plate 2 x 3 Plate 2 x 3
Part #: 3021 Black
Plate 2 x 2 Plate 2 x 2
Part #: 3022 Black
Plate 1 x 2 Plate 1 x 2
Part #: 3023 Black
Plate 1 x 2 Plate 1 x 2
Part #: 3023 Yellow
Plate 1 x 1 Plate 1 x 1
Part #: 3024 Black
Plate 1 x 1 Plate 1 x 1
Part #: 3024 Red
Plate 6 x 16 Plate 6 x 16
Part #: 3027 Black
Plate 6 x 12 Plate 6 x 12
Part #: 3028 Light Gray
Plate 4 x 6 Plate 4 x 6
Part #: 3032 Red
Plate 4 x 6 Plate 4 x 6
Part #: 3032 Light Gray
Plate 6 x 10 Plate 6 x 10
Part #: 3033 Black
Plate 4 x 8 Plate 4 x 8
Part #: 3035 Black
Plate 6 x 8 Plate 6 x 8
Part #: 3036 Black
Slope 45° 2 x 4 Slope 45° 2 x 4
Part #: 3037 Light Gray
Slope 45° 2 x 2 Slope 45° 2 x 2
Part #: 3039 Red
Slope 45° 2 x 2 Slope 45° 2 x 2
Part #: 3039 Light Gray
Window 1 x 2 x 2 Classic, Short Lip [with Glass] Window 1 x 2 x 2 ...
Part #: 3081c01 Red
Brick Special 1 x 2 with Cable Holding Square Cutout Brick Special 1 x...
Part #: 3134 Red
Hinge Plate 2 x 5 with Large Hole [Complete Assembly] Hinge Plate 2 x 5...
Part #: 3149bc01 Black
Train Direction Switch - 4.5V 2 x 3 Train Direction S...
Part #: 3218 Red
Vehicle Track, Train, Slotted Rail Straight Vehicle Track, Tr...
Part #: 3228b Light Gray
Vehicle Track, Train, Slotted Rail Curved Outside Vehicle Track, Tr...
Part #: 3229b 16× Light Gray
Vehicle Track, Train, Slotted Rail Curved Inside Vehicle Track, Tr...
Part #: 3230b 16× Light Gray
Slope 33° 3 x 4 Slope 33° 3 x 4
Part #: 3297 11× Light Gray
Slope 33° 3 x 2 Slope 33° 3 x 2
Part #: 3298 Light Gray
Construction Vehicle Bucket Arm, Small - 2 x 6 x 2 Construction Vehi...
Part #: 3314 Black
Brick Special 1 x 2 with Digger Bucket Arm Holder Brick Special 1 x...
Part #: 3317 Yellow
Construction Vehicle Bucket Smooth 3 x 5 x 1 & 1/3 Construction Vehi...
Part #: 3433 Yellow
Battery Box, Train Car with Black Base, Red Wheels and Magnets Battery Box, Trai...
Part #: 3443c02 Blue
Plate 1 x 8 Plate 1 x 8
Part #: 3460 Black
Plate 1 x 8 Plate 1 x 8
Part #: 3460 Light Gray
Train Buffer Single Train Buffer Single
Part #: 3488 Black
Brick Special 1 x 1 x 2 with Shutter Holder Brick Special 1 x...
Part #: 3581 Red
Window 1 x 2 x 2 Shutter Window 1 x 2 x 2 ...
Part #: 3582 Red
Plate 1 x 3 Plate 1 x 3
Part #: 3623 Red
Plate 1 x 3 Plate 1 x 3
Part #: 3623 Black
Fence Lattice 1 x 4 x 1 Fence Lattice 1 x...
Part #: 3633 Light Gray
Slope Inverted 45° 2 x 1 Slope Inverted 45...
Part #: 3665 16× Black
Plate 1 x 6 Plate 1 x 6
Part #: 3666 Light Gray
Plate 1 x 6 Plate 1 x 6
Part #: 3666 15× Black
Plate 1 x 4 Plate 1 x 4
Part #: 3710 Light Gray
Plate 1 x 4 Plate 1 x 4
Part #: 3710 Yellow
Plate 1 x 4 Plate 1 x 4
Part #: 3710 Red
Plate 1 x 4 Plate 1 x 4
Part #: 3710 Black
Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Plate Special 1 x...
Part #: 3794a Black
Plate 2 x 6 Plate 2 x 6
Part #: 3795 Black
Plate 2 x 6 Plate 2 x 6
Part #: 3795 Red
Plate 2 x 6 Plate 2 x 6
Part #: 3795 Yellow
Steering Stand 1 x 2 with Black Steering Wheel Steering Stand 1 ...
Part #: 3829c01 Yellow
Plate 2 x 10 Plate 2 x 10
Part #: 3832 Black
Window 1 x 4 x 3 Window 1 x 4 x 3
Part #: 3853 Yellow
Window 1 x 2 x 3 Shutter Window 1 x 2 x 3 ...
Part #: 3856 Yellow
Train Buffer Beam Train Buffer Beam
Part #: 4022 Black
Train Coupling Train Coupling
Part #: 4023 Black
Window 1 x 4 x 3 Train with All Studs Hollow Window 1 x 4 x 3 ...
Part #: 4033 Red
Glass for Train Window 1 x 4 x 3 Glass for Train W...
Part #: 4034 Trans-Clear
Window 1 x 2 x 3 Train Window 1 x 2 x 3 ...
Part #: 4035 Red
Glass for Train Window 1 x 2 x 3 Glass for Train W...
Part #: 4036 Trans-Clear
Brick Special 1 x 1 with Headlight Brick Special 1 x...
Part #: 4070 Black
Brick Special 1 x 1 with Headlight Brick Special 1 x...
Part #: 4070 Red
Plate Special 1 x 1 with Clip Light, Bar Hole [Thin Ring] Plate Special 1 x...
Part #: 4081a Black
Bar 1 x 4 x 2 with Studs Bar 1 x 4 x 2 wit...
Part #: 4083 Black
Tyre 21 x 8 Offset Tread Medium Tyre 21 x 8 Offse...
Part #: 4084 Black
Plate Special 1 x 2 with Ladder Plate Special 1 x...
Part #: 4175 Light Gray
Vehicle Base, Train 6 x 16 Vehicle Base, Tra...
Part #: 4178 Black
Wheels Train Spoked Small (23mm D.) and Black Brick, Modified 2 x 4 [Red] Wheels Train Spok...
Part #: 4180c04 Red
Door 1 x 4 x 5 Train Left Door 1 x 4 x 5 Tr...
Part #: 4181 Red
Door 1 x 4 x 5 Train Right Door 1 x 4 x 5 Tr...
Part #: 4182 Red
Glass for Train Door Lip On Top and Bottom Glass for Train D...
Part #: 4183 Trans-Clear
Tyre for Train Wheel for Electric Train Motor 12V Tyre for Train Wh...
Part #: 458 Light Gray
Plate Round 1 x 1 with Solid Stud Plate Round 1 x 1...
Part #: 6141 Trans-Red
Plate Round 1 x 1 with Solid Stud Plate Round 1 x 1...
Part #: 6141 Trans-Yellow
Battery Cover, Train Car Roof 6 x 14 Battery Cover, Tr...
Part #: 699 Light Gray
Magnet Cylindrical Magnet Cylindrical
Part #: 73092 Black
Train Track Sleeper Plate 2 x 8 without Cable Grooves Train Track Sleep...
Part #: 767 40× Dark Gray
Vehicle Track, Train, Level Crossing Center Rail Cap Insert 2 x 14 x 2/3 Vehicle Track, Tr...
Part #: 812 Light Gray
Vehicle Track, Train, Level Crossing Base Vehicle Track, Tr...
Part #: 813 Light Gray
Train Level Crossing Gate Type 1, Assembly with Blue Base & Red Handle (Right) Train Level Cross...
Part #: 815c01 White
Train Level Crossing Gate Type 1, Assembly with Blue Base & Red Handle (Left) Train Level Cross...
Part #: 815c02 White
Wire with 2-Prong Connectors, 12V / 4.5V 11L Wire with 2-Prong...
Part #: upn0257c11 White
Motor, Train, 4.5V 12 x 4 x 3 1/3 Type II Motor, Train, 4.5...
Part #: upn0259c01 Black
Train Signal Post Train Signal Post
Part #: upn0262 Red
Train Wheel Spoked for Motor Train Wheel Spoke...
Part #: upn0383a Red
Train Signal Circuit-Breaker Bar Train Signal Circ...
Part #: upn0387 Red
🧱 Sticker Sheet for...
Part #: 191895 [No Color/Any Color]
The set features a substantial number of train track elements in light and dark gray, providing ample opportunity for building and expanding train layouts. The inclusion of headlight bricks and various plates and slopes enhances the set's detail and functionality.

🛒 Where to Buy

eBay
✓ In Stock
$62.99
Walmart
✓ In Stock
$66.49
Target
✓ In Stock
$69.99
Amazon

💎 Notable Parts

Dark Gray Train Track Sleeper Plate 2 x 8 without Cable Grooves (40x) $8.00
Light Gray Vehicle Track, Train, Slotted Rail Curved Inside (16x) $4.00
Light Gray Vehicle Track, Train, Slotted Rail Curved Outside (16x) $4.00
Red Brick Special 1 x 1 with Headlight (8x) $6.00
Light Gray Vehicle Track, Train, Slotted Rail Straight (8x) $2.40
Est. BrickLink Part Value
$24.40

💡 MOC Potential

🚗 Expand the train with additional freight cars and wagons
🏙 Create a vintage LEGO town layout around the train tracks
🏛 Design a classic train station or depot for the train to service

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Charts Inventory Statistics

79
Unique Parts
416
Total Pieces
3
Minifigures
Inventory Version: 1