One of the dangers of writing historical fiction is that sometimes you can get distracted by research when you should be writing. Wondering where the railroad junction in Washington, D.C., was in 1861, I typed "map washington dc 1861" into my Google search bar--and found a map of Washington in 1861 overlaid on a map of the city today. I promptly got lost exploring the map.
But I still can't find the railroad junction. Argh!
You can check out the map here and get your nerd on!
http://rumsey.geogarage.com/maps/gcw0678500a.html
HN