Railway Engineers and Slime Mold?

Interesting article points out the similarity between Tokyo's suburban rail network layout and a network of tubes that the slime mold generated when presented with food sources in analogous locations.

I wanted to take a look at the rail network layout, and Wikipedia has one in an article on Tokyo-area transportation. I'll put the pictures here for your viewing pleasure.

Tokyo Rail Network (link)	Slime Mold Design (link)

The rail map is at the bottom so it'll be closer to the "F" map on the lower right.