This article here on the ArcGIS Blog, describes a newly released capability in ArcGIS Pro's LAS Classification tools called "Rail Selection".
If you have Lidar data that includes steel rails, choosing this option during point cloud classification, finds the points that represent the steel rails in the data captures and classifies them as such.
See this blog article for more details:
https://www.esri.com/arcgis-blog/products/3d-gis/3d-gis/classify-rail-points-in-mobile-lidar-point-clouds
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