Can you identify this modified plate? A friend asked me to identify an element, but I have no idea either. Customary search on BrickLink modified bricks/plates/tiles categories didn't give results.
I do not have any additional information besides this picture.
This looks like 
Plate, Modified 2 x 8 with Door Rail in yellow.

It's not easy to find because you would think it's a 1x8 plate modified rather than a 2x8.

Additional link: Plate, Modified 2 x 8 with Door Rail at rebrickable.