Release: NBER Macrohistory Database
Series Is Presented Here As Two Variables--(1)--Original Data, 1917-1927 (2)-- Original Data 1926-1939. Data Include Passengers On Subways, Elevated Trains, Street Car, And Buses Operated By Street Car Companies, Their Affiliates, And Companies Formerly In The Street Railway Business Along With Passengers On Independent Buslines. Source: American Transit Association Files; "Bus Transportation", Various Issues.
This NBER data series a03012bb appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.
NBER Indicator: a03012bb
National Bureau of Economic Research, Total Revenue Passengers, Street Railways and Buses for United States [A032BBUSA442NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/A032BBUSA442NNBR, September 18, 2020.