← Search American Economic Review 1981 Productivity growth, scale economies, and capacity utilization in US railroads, 1955-74. Douglas W. Caves1; Laurits R. Christensen1; Joseph A. Swanson2 1 University of Wisconsin–Madison · 2 Finance Sources openalex Cite APA 7 MLA 9 Chicago (author–date) Harvard Elsevier Harvard (JFE, JBF…) The Accounting Review Academy of Management American Marketing Association INFORMS (Management Science) Copy citation Copied ✓