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Big Boy 4-8-8-4 Steam Engine
Union Pacific 
No. 5115 -1967 Release
No. 5114
No. 5114-02
No. 17581

Built by Rivarossi for AHM, this HO Union Pacific 4-8-8-4 "Big Boy" originally sold for $49.95 and was introduced in 1967. I can remember seeing them at Woolco on special for $19.88 in the early 1970s. By 1980, AHM was listing this model at $389.98.

Image sources include AHM product catalogs and advertisments, as well as images from eBay auctions and other sources. Information presented comes from variety of sources including product catalogs, magazine articles and Wikipedia.