Thanks, great info!
Did Postwar Flyer ever make 3' straight sections?
As to the original post, the track with the sharp pins was 3-rail American Flyer track. The following post is an excellent description, and is identical to my initial examination and evaluation of the track: C W Burfle posted:
"American Flyer wasn't alone in using sharp track pins. Over the years I've seen plenty of tubular track with track pins that looked like the pointed end of a nail. Judging by the way the pins were inserted, they did not look to be user installed."
I honestly thought someone had run out of track pins and fashioned them from nails -- Obviously a different era.