I stumbled upon this site with quite an extensive collection of late 1800s vintage maps, many of which include railways and key areas of interest (industry/mining) and the relavant topography.
To download the maps, choose the 'export' function in the upper right area.
http://www.davidrumsey.com/luna/servlet/RUMSEY~8~1
There's also a downloadable viewer (MrSID viewer) for the map files so you can pick out detail, the overviews are too far out for specifics.
...these are mainly late 1890s/turn of century maps...