Here are some railway tracks with procedural shader nodes for the rails, stone ground and concrete parts.
https://www.cgtrader.com/3d-models/vehicle/train/railway-tracks-procedural-shader-nodes-curve-based-editable
I created these shader nodes for baking the textures for the Railroad Parts (Curve-Based and Low-Poly).
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Parts:
Track for linearity paths
(less polygons)
without stoneground
* 5164 Polygons
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Track for linearity paths
(less polygons)
* 5172 Polygons
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Track for curved paths
(more polygons to round up)
* 7416 Polygons
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Track for curved paths
(more polygons to round up)
without stoneground
* 7416 Polygons
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The ground only
for curved paths
* 80 Polygons
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Just the rails
for curved paths
* 3344 Polygons
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Some examples with modifiere setup
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