The original Nicholas Smith passed away in 1973. There's a photo of the original Philly building in the current store ~ a neat structure it was.
The aspect that separates Nicholas Smith from every other train store I've ever visited is the floor to almost-ceiling shelves of every scale/gauge. I imagine this is what hardware/train stores were like in the 1920s/30s. I think what I like best is finding stuff that is a bit older and sought after without sought-after prices, if you know what I mean.