Chicago rail interchange
The largest rail interchange in North America and the point where eastern and western Class I railroads hand freight to each other. Almost every transcontinental intermodal move touches it, which makes it the country's single most consequential inland bottleneck.
How much moves through it
What a disruption here moves
Standing structural relationships, not forecasts. We name the direction and the mechanism, and link the published index where you read the current value — we do not quote a number we cannot cite.
Interchange between railroads is the binding constraint, so congestion shows up as terminal dwell hours before it shows up in transit times.
- Rail Traffic Data (weekly) · Association of American Railroads
- Railroad Performance Measures · Surface Transportation Board
Shippers convert intermodal moves to over-the-road when rail dwell rises, tightening the Midwest truckload market.
- DAT Truckload Volume & Rate Indexes · DAT Freight & Analytics
How a problem here propagates
- Interchange between railroads, not line-haul capacity, is the binding constraint. Congestion shows up as terminal dwell hours long before it shows up in transit times.
- Winter operating conditions cut effective throughput on a predictable seasonal cycle, independent of demand.
- Because it is a handoff point, a service problem on one railroad becomes a network problem for all of them within days.
Recent movement on this corridor
- Jul 27, 2026WatchCanadian National won’t fight UP-NS merger under new dealSupply Chain Dive
Other domestic corridors
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