As we all know, every major urban area with a railway will usually have two things....a below grade route for the trains and graffiti! As part of my effort to move my trains further back from the edge of the layout (by simply attaching 4" or so boards to the edges) I've been able to add some features that weren't in my original plans, and make formally boring areas of the layout a little more interesting.
The graffiti decals are primarily from a seller on eBay, and overall I think they look quite good. I still need to do a bit more weathering on the walls to hide the decal edges.
The bridge in the upper photo is a Tomytec bridge which will be appropriately weathered and...uhh...likely 'tagged' as the kids say these days.