Marker.......
Wow! What a shot! My friends that model southeastern roads would love this golden slice of history.
I hope I'm not violating any rules but PLEASE join the ACL-SAL-SCL Modeler's group on Yahoo. Your photos and personal experiences would certainly be treasured there! I hope that you'll recover your photos in good condition. If you do so, when you edit them include your name in one of the corners. I usually to that to my photos with the "GIMP" photo editing software.
May I have your permission to use your photo or any future photos you'd be willing to share? I list the credit and I don't make any money off of photos from others. I use other modeler's photos as reference for metalizing, which I, in turn, then share my info and research openly.