I didn't have enough room to model both the Platte and Jefferson Creek, so one end of my Jefferson scene is bounded by the river instead of the creek. The town of Jefferson also had to be mirror-imaged, and the siding extended over the "creek" along with the mainline. I used that opportunity to imagine an upgraded mainline trestle with frame bents on stone foundations, while the siding soldiers on with its original pile bents.
Building the trestle stringers (the square bits are red construction paper stained with oak and ebony wood stains):
My modified Black Bear trestle jig, and a custom 2º wedge for my true sander:
The piles are carved from square stock, and then epoxy-bedded into oversized holes in the river bed:
This allowed me to remove the trestle deck to finish landscaping the river bed:
Cheers,
Jeff.