Series Is Presented Here As Two Variables--(1)--Original Data, 1914-1936 (2)--Original Data, 1933-1943. The Fare Index Is For The Average Street Railway Fare In All U.S. Cities With A Population Of 50,000 Or More, Except New York City, And Weighted According To Population. Beginning In 1933 Bus Fares Were Included. Source: Data For 1933-1935 And June 1940-December 1943: Direct From F.S. Kalberly. Data For 1936-1939: "Public Utilities", Moody'S Manual Of Investments.
This NBER data series m03014b appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.
NBER Indicator: m03014b
Release: NBER Macrohistory Database
National Bureau of Economic Research, Index of Street Railway and Bus Fares for United States [M0314BUSM324NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M0314BUSM324NNBR/, November 26, 2015.