From Cincinnati Facts and Figures, published in 1921:
"One street railway system covers the entire city. A 5c fare is charged with transfer from any line to any other line in the same general direction. The daily mileage is upward of 65,000 miles on about 227 miles of track. Two thousand and five hundred employees keep the system in condition to give service to about 157,000,000 passengers yearly."
Public Library of Cincinnati & Hamilton County, Library bookmobiles in front of Union Terminal, year unknown.