Notes:

TSI Combined - The TSI, created by the U.S. Department of Transportation, Bureau of Transportation Statistics, is a measure of the month-to month changes in the output of services provided by the for-hire transportation industries. TSI data change monthly due to the use of concurrent seasonal analysis, which results in seasonal analysis factors changing as each month's data are added. This product uses the FRED API but is not endorsed or certified by the Federal Reserve Bank of St. Louis.

TSI Freight - Includes freight railroad services (including rail-based intermodal shipments such as containers on flat cars); inland waterway traffic; pipeline movements (including principally petroleum and petroleum products and natural gas); and air freight

TSI Passenger - The passenger transportation services index consists of: local mass transit; intercity passenger rail; and passenger air transportation