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UP Grey Big Boy

Based on the livery worn by Challenger 3977, which is currently on display in North Platte, Nebraska. In the display with the Challenger is an EMD DDA40X, which - at 98 feet long - is the largest diesel locomotive in the world.

The number carried by my reskin is that of a real-life Big Boy. It is also the number of a DC class diesel locomotive, which I had the pleasure of seeing at Christchurch's Middleton Yard while on holiday in the South Island. As for Big Boy 4012, I believe she is on display at Steamtown in Scranton, Pennsylvania.

Lastly, I want to thank Frantic for using the grey Big Boy in one of his videos:
https://www.youtube.com/watch?v=2yD_bxAToHU