@book{352720,
	author = {Weatherford, Brian A.;Willis, Henry H.;Ortiz, David S.;Mariano, Louis T.;Froemel, J. Enrique;Daly, Sara A.},
	title = {The State of U.S. Railroads},
	publisher = {RAND Corporation},
	year = {2008},
	url = {www.jstor.org/stable/10.7249/tr603upsf}
}