Freight pulse • Week ended 3 October 2026
AAR's U.S. rail traffic series rose 5.1% from the comparable 2025 week, with intermodal growing faster than carloads. The report points to stronger reported unit volumes, but cannot by itself establish a broad economic acceleration. Its carrier coverage and mixed counting units matter as much as the headline growth rate.
The 7 October AAR release records 529,712 carloads and intermodal units: 230,711 carloads, up 2.4%, and 299,001 containers and trailers, up 7.4%.
Coverage caveat: the U.S. series excludes U.S. operations of CPKC, CN and GMXT. It is a carrier-group series, not a complete measure of freight moved inside U.S. borders. See footnote 1 on page 1 of AAR's report.
Intermodal supplied the larger share of counted units
Two components of the reported total
Week: 56.4% intermodal / 43.6% carloads
First 39 weeks: 55.4% intermodal / 44.6% carloads
The weekly intermodal share was about one percentage point above its share in the cumulative period. That is a comparison with a year-to-date mix that includes this week, not a year-over-year market-share gain. It describes the composition of these counts, not a shift between rail, trucks and ships.
The five-percentage-point gap between intermodal and carload growth is also worth separating from the combined headline. A total can conceal divergent components. Reading both makes the release more useful for a reader tracking container logistics than simply assuming that every rail activity expanded at the same rate.
Breadth adds context without weighting the economy
Seven growing groups, three declining
Breadth asks how widely an increase is distributed. Contribution asks which categories explain the change in the aggregate. Those questions can produce different answers: many small categories can rise while a larger category falls. A count of positive categories therefore belongs beside the total, rather than serving as a substitute for it.
Compare the week with the year-to-date record
| Measure | Week ended 3 October | First 39 weeks |
|---|---|---|
| Carloads | 230,711 / +2.4% | 8,910,593 / +2.7% |
| Intermodal units | 299,001 / +7.4% | 11,077,697 / +4.2% |
| Combined units | 529,712 / +5.1% | 19,988,290 / +3.5% |
Source: AAR report, page 1. Weekly growth compares one week with its prior-year counterpart. Cumulative growth compares two 39-week periods. A stronger weekly percentage does not establish a sustained acceleration.
Show the share and growth-gap calculations
Weekly intermodal share: 299,001 ÷ 529,712 × 100 = 56.44596%. Cumulative share: 11,077,697 ÷ 19,988,290 × 100 = 55.42093%. Their difference is 1.02502 percentage points. The reported weekly growth-rate gap is 7.4% − 2.4% = 5.0 percentage points; it is not a 5% relative increase.
What would make the signal more convincing?
Look for persistence across subsequent reports using the same coverage, then compare the relevant commodity or intermodal category with the business question at hand. An industrial supplier, a consumer-goods shipper and an agricultural exporter need different parts of the report. No single total can give all three an equally precise demand signal.
For a macroeconomic reading, shipment counts need context about cargo, prices and activity outside this reporting group. GDP measures value added across the economy; this release counts transport units. Treating the two as interchangeable would turn a useful freight observation into a claim the data cannot support.
