The Pennsylvania Railroad, Volume 1: Building an Empire, 1846-1917 - Albert J. Churella - Google Books

https://books.google.de/books?id=OXdjEZke74QC&pg=PA410&lpg=PA410&dq=%22Keokuk+&+Hamilton+Bridge%22&source=bl&ots=3r62-0IXiQ&sig=

"Do not think of the Pennsylvania Railroad as a business enterprise," Forbes magazine informed its readers in May 1936. "Think of it as a nation." At the end of the nineteenth century, the Pennsylvania Railroad was the largest privately owned business…