sentences:  In 1846 it reached Covington, and by 1847 traffic was moving through the county via the canal.Completion of the county's first railroad line in the 1850s heralded an end to the canal's usefulness, and in 1875 the last canal boat passed through Covington.The first railway line through the county was the Toledo, Wabash and Western Railway (later the Wabash Railroad) which was built from the east across the northern part of the county and reached Attica in 1856; it continued west through Warren County and reached the Illinois state line the following year.