Chuck Posted June 22, 2018 Share Posted June 22, 2018 Ever wonder just how big the interior of an actual Union Pacific Big Boy firebox is? It's huge! Even the water circulators/ arch supports are big as they have to be in the 10" - 12" size??!! Quote Link to comment Share on other sites More sharing options...
Rayman4449 Posted June 22, 2018 Share Posted June 22, 2018 Really something else! Didn't realize they had the brick/blocks above as well. Adds yet another perspective on just how much labor was involved working on these things! Quote Link to comment Share on other sites More sharing options...
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