I made this quick app to help track the progress of games of Rail Baron.
You can select lines either by clicking on the line directly or by using the dropdown menu.
Choose a color with the second dropdown, and click "Apply Color" to apply the color to the selected line.
The filter toggle allows you to see only lines that belong to the currently selected color or that are still unowned.
If this map is helpful to you, I'd be excited to hear about it.
The game Rail Baron was originally created by Avalon Hill, then sold to Hasbro Interactive.
Rail Baron is now an internationally registered trademark of Intersystem Concepts, Inc.