The flat car is either a Ft-I Built in 1910 or Ft-J Built in 1913 44 foot car.  

Here are two photos of an Ft-I 190080 Built 9-1910 in Barstow Yard in 1993 and 1994.

With all due respect, the car that I asked about does not match car 90080. It has fewer stake pockets (12 vs 14), the shape of the stake pockets themselves is different, and the drop sills lack the three vertical flanges.
On the other hand, the photo of Ft-P 90806 does match the car I asked about. It also found this car:
http://www.rr-fallenflags.org/atsf/atsf190618ags.jpg

Jim Eager