Experience two of the most legendary locomotives in American railroading with the Promontory Steam Pack from Bigboysbricks. This premium bundle includes highly detailed LEGO-compatible models of the iconic Union Pacific Big Boy and the legendary Union Pacific 844.
 
The kit is produced using high-quality GoBricks parts, along with precision custom components from MackBricks.
Performance & Compatibility
Minimum track radius: R104
Designed for large radius L-gauge train layouts
Compatible with Power Functions style systems
 
Locomotive Specifications
Union Pacific Big Boy
The Union Pacific Big Boy is one of the largest steam locomotives ever built. This model captures the massive articulated design and incredible power of the prototype.
Features
3 PF-style L motors mounted inside the boiler
Designed for R104 minimum radius curves
Union Pacific 844 (FEF-3)
The Union Pacific 844 is one of the most famous operating steam locomotives in the world and the last steam locomotive delivered to the Union Pacific Railroad.
Features
2 PF-style L motors mounted inside the boiler
Built for R104 minimum radius curves
Bundle Value
Individual prices:
Big Boy: $549.99
844: $319.99
Total value: $869.98
Promontory Steam Pack  $649.99