The Union Pacific Big Boy is a type of simple    manufactured by the  (ALCO) between 1941 and 1944 and operated by the  in revenue service until 1962.

The 25 Big Boy locomotives were built to haul  over the  between  and . In the late 1940s, they were reassigned to , where they hauled freight over  to . They were the only locomotives to use a 4-8-8-4 : four-wheel leading truck for stability entering curves, two sets of eight driving wheels and a four-wheel trailing truck to support the large .

Today, eight Big Boys survive, with most on static display at museums across the country. One of them, , was re-acquired by Union Pacific and rebuilt to operating condition in 2019, regaining the title as the largest and most powerful operating steam locomotive in the world.

Sock details:

Made in Taiwan 

80% Cotton / Nylon Blend

20% Spandex

Wash in cold water

Do not bleach

Do not iron

Hang dry for best results