I stared out by using my hot knife to dig out the river bed. Next I used plaster-soaked paper towels to smooth out the banks. The bridge itself is one half a of a Monroe Models stone arch bridge kit.I painted it with some inexpensive grey acrylic paint. Then I added some Plastruc C Channels painted Floquil "Rust" to simulate the steel reinforcements the PRR added to it's stone bridges after WWII. The actual tunnel under the tracks is a PVC pipe coupling cut in half and painted black. I added a Plastruct Handrail to each side of the bridge and painted them Floquil "Grimy Black."
As for the river bed, I painted the whole thing raw umber to give it and earthy undercoat. Then I used all three sizes of Woodland Scenics Talus to create the rocky bottom and added some "Dead Fall" to simulated fallen trees and submerged logs. With that done, I used some WS field Grass to simulate reeds and bulrushes.
The step I'm currently on is adding water. This phase takes forever because it must be done in multiple layers. For water, I use Modpodge Super Gloss Medium. It's basically the same stuff as Woodland Scenics Realistic Water only it's cheap and readily obtainable at Wal Mart. Once the water is done, I will be adding turf to the banks.
In between coats of water, I've also been working on weathering rolling stock. Nothing too special to report here. I start out with an India Ink wash followed by a coat of Acrylic Matte Finish. Next come the chalks and then another coat of matte finish. All in all I think these cars turned out pretty good.
I've also been working on some structure projects but that's another post for another day.