Panoramio photograph of this bridge. The photograph is "All Rights Reserved", so I am just going to post a link.
http://www.panoramio.com/photo/101529660?source=wapi&referre...
The bridge is a 5-panel Pratt truss. If I had to guess a construction date, I would say ca. 1885-1895. It looks too heavy to be earlier than that, but it does not have the standardized appearance of a post-1900 bridge either.
Bing Maps has some new aerial imagery for the area. This one looks very lightweight for a railroad bridge. Hopefully the Landon Trail folks will re-use it and not replace it with a MOB.
Made it to this one with my buddy Wayne on Saturday. Very much looking forward to the nature trail opening up through this, neat old bridge