2-6-6-6 Allegheny Vs. Union Pacific Big Boy Steam Locomotive!
https://prrt1steamlocomotivetrust.org/ - Please help fund the T-1 Trust! They are a wonderful organization, building an advanced new 4-4-4-4 T-1 steam locomotive from scratch!
One of the most viewed Big Boy and Allegheny steam train comparisons on youtube! One is the largest, and another is the most powerful. This is a response video to the Trains Magazine article known as "Big Boy."