Here are some railway tracks with procedural shader nodes for the rails, stone ground and concrete parts.
I created these shader nodes for baking the textures for the Railroad Parts (Curve-Based and Low-Poly).
Parts:
Track for linearity paths(less polygons)without stoneground
Track for linearity paths(less polygons)
Track for curved paths(more polygons to round up)
Track for curved paths(more polygons to round up)without stoneground
The ground onlyfor curved paths
Just the railsfor curved paths
Some examples with modifiere setup