Identify all the major railroads

I am a seventh grade United States History teacher at a middle school who is trying to identify all the major railroads in the United States in the 1860s to 1890s. This is proving to be a daunting task.

I am impressed with many of the maps you have on your website. ...

Christopher Etchechury, M.ED
Social Studies Subject Area Lead Teacher
Sterling Middle School
CETCHECH@loudoun.k12.va.us