Computed By NBER From Per Cent Unserviceable Figures By Subtracting Them From 100. New York Central Figures Are Not Available, 02-12/1920; Missouri-Pacific Figures Are Not Available, 02-03/1920; Fort Smith And Western Are Not Available, 03/1920. 1920-1934 Data Are Daily Averages. 1935-1942 Data Are Midmonth Computed By NBER From End Of Month Data. Beginning With 1935, Data Were Computed By NBER By Summing "Number Serviceable (Not Stored)" And "Number Serviceable (Stored)" And Using Figures Of Series 01250 And 01251. Switching And Terminal Companies Are Excluded Through December 1936. They Are Included Thereafter Beginning In February 1937. The January 1937 Figure Is The Average Of The 12/1936 And 02/1937 Figures. There Was A Strike By Equipment Maintenance Workers From July-September 1922. Source: 1920-1934 Data Are From Interstate Commerce Commission, Freight And Passenger Service Operating Statistics Of Class I Steam Railways In The United States; 1935-1943 Data Are From Icc, Motive Power And Car Equipment Of Class I Steam Railways In The United States.
This NBER data series m01252 appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: m01252
Release: NBER Macrohistory Database
National Bureau of Economic Research, Per Cent Serviceable of Total Freight Locomotives, Class I Railroads for United States [M01252USM156NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M01252USM156NNBR/, September 5, 2015.