sentences:  A small portion of lies in the far northwestern corner of the county, following the county and state border north from State Road 26 for only about before leaving Warren County and entering Benton County on its way through the small town of Ambia.A Norfolk Southern Railway route connecting Danville, Illinois, with the city of Lafayette is the county's busiest rail line, carrying about 45 freight trains each day.It enters Warren County at State Line City and passes northeast through the communities of Johnsonville, Marshfield, West Lebanon and Williamsport before exiting the county at Attica.