This is an excellent project.
As my family traveled across the Mississippi River from Memphis, Tennessee into Arkansas, We followed the Railroad all the way to Marked Tree, Arkansas. I do not know the name of the lines that ran on those tracks, but some pretty long trains. The tracks went through downtown Marked Tree. My uncle would pull up onto the track and turn the motor of the vehicle off. It frightened me and I just wouldn't ride with him.
There was a little community called Old Weona (Poinsett County) that the Tschudy family owned. They focused on the timber industry and it seems like I remember my mother saying they had a railroad sideline, which retrieved the timber. The Tschudy's brought my grandfather from Caruthersville, Missouri to Old Weona in 1927. He lived in Poinsett County the rest of his life, first in Old Weona, then Weona, and finally they built a home in Marked Tree with the St. Francis River down the street and the railroad tracks just another block.
On another note, I added the Richard Tull family of Philadelphia, Pennsylvania. Richard was the treasurer of the Philadelphia and Reading RR in Pennsylvania.