I see from the linked article, it was designed for 2 lanes of traffic as well as a street car. That explains the larger than normal size of the floor beams.
VDOT rehabilitated this bridge in 2001-2002. They evidently took apart the truss and had it completely galvanized. It now has a bright silver-like appearance. There is an interest web article on the bridge's restoration on the FHWA website. See it at this address... http://www.tfhrc.gov/pubrds/04jan/07.htm