Historic Railways of the DC, Richmond, Baltimore, and Wilmington region
Based on the 1921 Official Guide of the Railways, this is accurate as far as I can tell but any corrections are welcome.
It has over 1,380 stations, 136 lines, and includes all of Delaware, nearly all of Maryland and hefty chunks of both Virginia and Pennsylvania. There are doubtless at least a few errors.
Prints available: www.thegreatermarin.org/map-store/preorder-age-of-rail-dc...