That retaining wall is a Woodland Scenics HO Retaining wall. you know...the one that is made of plaster! 
It's amazing how realistic it became when hit with a Minwax Walnut colored stain-stick.
The trestle is light-weight balsa wood held together with carpenter's glue, and could withstand a 5 pound lead weight on a 4 truck flatcar.

It's amazing how realistic it became when hit with a Minwax Walnut colored stain-stick.
The trestle is light-weight balsa wood held together with carpenter's glue, and could withstand a 5 pound lead weight on a 4 truck flatcar.