Media type: E-Article Title: Variability of Track Investment with Traffic for Class I Railroads in the United States Contributor: Tolliver, Denver; Lu, Pan imprint: Scientific Research Publishing, Inc., 2019 Published in: Modern Economy Language: Not determined DOI: 10.4236/me.2019.104082 ISSN: 2152-7245; 2152-7261 Keywords: General Medicine Origination: Footnote: Access State: Open Access