Union Pacific Challenger Locomotive Boiler and Smokebox

Challenger Boiler built by Ed Perry.  Type 122, 1/2" copper flues set up
for propane.  Never used, dirt is from storage.  Includes machined
smoke box.  Built from SA-106B seamless carbon steel for the shell. ASTM
A-285 boiler plate for the firebox and tube sheets.  Stays made from
M-1020 steel.  All welded construction