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Table 1: Description of the Bureau of Transportation Statistics Freight Transportation Services Index, Dow Transportation Index, and Cass Freight Index

IndexBasisFrequency of publicationRelease DateAdjustments
BTS Freight Transportation Services IndexTon miles shipped for five freight for-hire transportation modes.MonthlyData for given month released at the beginning of the month two months later Seasonally adjusted and weighted by dollar contribution of the modes to the economy.
Dow Transportation IndexStock prices of 20 large for-hire transportation companies.DailySame day as day data calculated forPeriodic changes to the stocks in the index; adjusted for stock splits.
Cass Freight IndexShipments and freight expenditures of shippers purchasing for-hire transportation using Cass Information Systems.MonthlyData for previous month released the month afterTonnage is summed across modes. Not seasonally adjusted.
Dataset Excel: