Triple 14 — Wednesday, September 09, 2026

TL;DR — the day in rail + freight. U.S. railroads continue to post strong volume gains, with the most recent AAR data showing total traffic up 4.2% year-over-year for the week ending August 22, 2026 [1]. Intermodal remains the primary growth driver, rising 5% alongside a 3.2% increase in carloads [1]. On the regulatory front, the Surface Transportation Board (STB) is advancing its review of the proposed Union Pacific and Norfolk Southern merger [1]. Weather-related disruptions remain a factor for Class 1 operations, particularly through major hubs like Chicago and Western mountain passes [2].

Market snapshot — rail + intermodal rates, volumes, capacity. For the week ending August 22, 2026 (Week 33), U.S. weekly rail traffic reached 532,462 carloads and intermodal units, a 4.2% increase compared to the same week in 2025 [1]. Total carloads came in at 235,885 units, up 3.2%, while intermodal volume was 296,577 containers and trailers, up 5% year-over-year [1]. Seven of ten carload commodity groups posted increases, led by metallic ores and metals (up 9.5%), chemicals (up 6%), and grain (up 9%), while motor vehicles and parts slipped 10.4% [1]. Cumulative volume for the first 33 weeks of 2026 stands at 7,511,910 carloads (up 2.7%) and 9,301,986 intermodal units (up 3.8%), reflecting a solid capacity utilization trend across the network [1]. North American weekly volume across nine reporting railroads totaled 728,172 carloads and intermodal units, up 5.6% [1].

Service advisories — Class 1 disruptions: weather, derailments, labor, maintenance windows. Class 1 railroads face ongoing weather-related vulnerabilities that can trigger service disruptions. Active storm systems in the Western U.S. bring heavy rain to coastal California and Oregon, along with high mountain snowfall in the Sierra and Cascades, posing risks of flooded tracks, mudslides, and wind-related debris that can force speed restrictions or line closures [2]. In the Midwest, the Chicago hub remains the primary bottleneck in North America, where mixed ice and snow can immobilize switches and require manual intervention, creating long dwell times that magnify nationwide delays when volumes are high [2]. Higher baseline volumes in 2026 have increased yard occupancy and reduced operational slack, making it harder for railroads to recover from single-event disruptions [2]. No material development regarding recent derailments, labor actions, or scheduled maintenance windows is present in the fetched sources this cycle.

Port congestion — major ports (LA/LB, NY/NJ, Savannah, Houston): dwell, backups, chassis. No material development in the fetched sources this cycle regarding specific port congestion, dwell times, backups, or chassis availability for the major ports of Los Angeles/Long Beach, New York/New Jersey, Savannah, or Houston. Source [2] notes that intermodal ramps around the Los Angeles/Long Beach complex may experience yard congestion during wet-weather operations, but detailed metrics on current port dwell times and chassis pools are unavailable.

Regulatory — STB rulings, demurrage rules, tariffs, policy. The Surface Transportation Board (STB) is actively reviewing the proposed merger between Union Pacific and Norfolk Southern, with regulators having set a schedule for the review process [1]. Both Union Pacific and Norfolk Southern are defending their rail merger application as the STB review advances [1]. No material development regarding demurrage rules, tariff changes, or broader freight policy rulings is present in the fetched sources this cycle.

Signals worth watching — what to track next. Freight brokers and shippers should monitor the STB's review schedule for the Union Pacific and Norfolk Southern merger, as outcomes could significantly alter network dynamics and competitive rates [1]. Additionally, watch for the AAR's upcoming weekly rail traffic reports to see if the strong intermodal growth trend continues, especially given the 5% year-over-year gains seen in late August [1]. Weather patterns heading into the fall season will be critical, as early 2026 demonstrated how rapidly heavy rain, flash flooding, and cold snaps can cascade into major delays at critical bottlenecks like Chicago and coastal intermodal yards [2]. Finally, track the chemical and grain sectors, which have shown notable recent carload increases, potentially signaling broader supply chain shifts [1].

Sources 1. https://www.freightwaves.com/news/chemical-shipments-percolate-in-latest-rail-data 2. https://weathers.news/spotlight-weekly-rail-trends-and-the-weather-events-that-can