This bridge was my Irresistible. I searched for many years for a model ( in any gauge ) of this famous bridge designed by Wendal Bollman for the B&O Railroad ... whose prototype is two blocks from my house. This uniquely designed truss bridge system was the first iron railroad bridge type in the USA. The B&O, at one time had around 100 of these bridges throughout its' system. Civil War photos of Harpers Ferry WV shows Bollmans carrying the B&O mainline across the Potomac River. The Bollman near me is the last of its kind and is listed both as a National Historic Site and a Civil Engineering Landmark. Although my O gauge model is not an exactly detailed replica down to the last rivet, it is, however, close enough for me.
I saw this model at the Orange Hall at York. For me it was like the moment, in the movie Christmas Vacation, in which Chevy Chase laid eyes on the perfect Christmas tree. Since I had been searching for this bridge for many years, I knew this was my "irresistible" moment ... LOL! 
