This magnificent creation is the work of previous bloggee and TLCB Master MOCer Dennis Glaasker aka Bricksonwheels, and it’s something rather special. It’s a Union Pacific ‘Big Boy’ locomotive, and unlike most of Dennis’ builds it’s a relatively small 1:38 scale. But that doesn’t mean it’s a small build; at over a metre long it takes three Power Functions XL motors mounted in the tender to drive it, which is probably the most power any mini-figure has ever had.

Building such a huge locomotive presented Dennis with several building challenges. LEGO don’t make train wheels large enough, so Dennis worked with a friend to design and manufacture unique 3D printed wheels – complete with LEGO-compatible valve gear. A Tamiya RC battery provides the power, connected via an SBrick control module to ensure the battery power remains derestricted, and the train’s lighting is taken care of via a neat Brickstuff LED kit.

Whilst some way from a completely Lego build, Dennis’ creation shows how exceptional a model can be when LEGO bricks are used alongside specialist components.

If you’re interest in learning more about the Union Pacific build and the components used to create it you can visit the model at Dennis’ Flickr photostream here, where there are also links to the third-party suppliers and where you can see the other amazing creations that Dennis has built.

*In the voice of your Mom