MOC-89126 Union Pacific 4014 Big Boy
From The Designer-Morningstrummer
“Designed by Morningstrummer of Rebrickable, the product is a highly realistic replica of the Big Boy steam locomotive, the largest and most powerful steam locomotive in history. It is the only steam locomotive with 4-8-8-4 wheels in the world. There are two sets of driving wheels in front and rear of the train, each set of four axle eight driving wheels, and two axle four wheels without power guide wheels or slave wheels. Two sets of driving wheels have independent pistons and crank connecting rods. Length: 89cm, Width: 8.5cm, Hight: 13.5cm.”
Features:
- Made of high quality, eco-friendly ABS plastic which is odorless and has no rough edges.
- 3200+ parts . The parts are compatible with other building block brands, being neither too tight nor too loose.
- Detailed PDF manual on USB drive.
- The parts in this MOC set are sorted manually and all care is taken.
- If there are any missing or damaged parts, please contact us for FREE replacement.
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FAQ
Most frequent questions and answers
The Big Boy is a highly realistic replica of the largest and most powerful steam locomotive in history, featuring an accurate 4-8-8-4 wheel configuration and intricate design elements like independent pistons and crank connecting rods.
Yes, the parts are fully compatible with other major building block brands, designed to ensure a proper fit—neither too tight nor too loose.
The set is made of high-quality, eco-friendly ABS plastic, which is odorless and free from rough edges, ensuring a safe and enjoyable building experience.
If you encounter any missing or damaged parts, contact us directly. We offer FREE replacement parts to ensure your set is complete.
Yes, a detailed PDF instruction manual is included on a USB drive, providing step-by-step guidance for assembling the Union Pacific 4014 Big Boy.
Yes, the set includes two motors. If they have opposite polarities, you can resolve this by placing them on different spots on the IR receiver or by mirroring the front carriage during assembly.
The parts come unsorted in various bags, requiring sorting before assembly. No bag numbering is provided, so organizing the pieces beforehand will enhance the building experience.
The model can run on LEGO tracks, but it may struggle with tight curves and can be slow. Its large size and fragility make it better suited as a display piece.
Yes, additional tools such as a stud extractor/brick remover and rubber-tipped pliers are included to help with assembly.
Yes, it’s a great addition for collectors, especially for those interested in trains or large-scale models.
The assembly requires patience and skill due to its detailed design, making it best suited for experienced builders.
To make the Big Boy playable, modifications are recommended, such as lubricating all moving parts with Vaseline or white lithium grease. This helps reduce friction and ensures smoother operation, especially if you’re running the model regularly.
The Big Boy performs best on wider tracks, such as R72 or larger radius. It can run on R40 tracks but may struggle with speed and appearance. For optimal performance, aim for R56 or wider tracks.
