Since the railroad was the primary method for national travel in the 1930's and '40's, I occasionally search items of interest, such as: how many people can a US coach-car carry? I came across this site which has many "route maps" of that era -- almost too many. http://www.r2parks.net/railindex.html It seems regional railroads organized on a "trunk line" system, perhaps similar to the "hub" system of today's airlines. The list is so long that I had to browse for a while but eventually recognized many of the large operators such as New York Central Pennsylvania Baltimore and Ohio Southern Great Northern Chicago Great Western Union Pacific Southern Pacific also some Canadian railroads For viewing the "route maps", right click the image and select "View Image" on most browsers. If not any more clear, there is usually a larger image available. "Route maps" are nice but if you want to see the actual rail lines you will need to do more searching. I found this for the Pennsylvania. http://pabook.libraries.psu.edu/palitmap/PARRMap1931.jpg Route Map http://www.r2parks.net/pamap1.JPG Of course the US Army chartered trains from the regional Reception Centers to the many new training camps -- mostly 'down South'. But soldiers on leave, before going overseas, often took the train home and back to camp. Units moving to their Port of Embarkation also moved by chartered trains -- a whole Division by several trains. Soldiers often described these "troop trains" as slow and low priority based on their time spent on sidings letting other trains pass.