Concrete Fence Post Schodack N.Y.

I discovered on a stop one day to my now deceased Aunt(Covid in Texas) home a strange sight. It was a concrete fence post on her property on South Schodack Road. Other explorations led me to discover 2 more such fence posts along the road in front of a small wooded piece of property next to her house. I have last week discovered one off Niverville Rd in Columbia County. Some still have old fencing embedded in them.So the question arises what were they used for? It is most certain an average farmer would not have used concrete to make fence posts. Most likely wood and barbed wire. So what were they used for.Talking the last time with my aunt before she left for Texas and my general speculation is the railroads. All of the fence posts were found nead railroad tracks. So I believe they marked a right of way for the railroads. I would speculate they were put in at the turn of the 20th Century. The wire is old and brittle and the concrete shows signs of wear. Tops broked off and pitted. Though they are still very much embedded in the ground. So my latest discovery......a interesting find without any digging. Be Seeing You.