Pull the monthly train counts for the border’s 2 busiest rail crossings, and the lines do something they’ve never done: they touch. In the 12 months through April, 3,784 trains entered the United States at Eagle Pass and 3,769 at Laredo. In early 2023, Laredo ran about 370 trains a month and Eagle Pass about 240.
We noticed the convergence a few days ago and went looking for what’s behind it. The answer turned out to be 3 stories stacked on top of each other, and the most interesting one has nothing to do with trains.
Where the trains went
The cleanest signal in the data is cargo trucks: vehicles built to haul goods (HS 8704), a category that runs from pickups to heavy work trucks. Imports of them fell $3.07 billion at Laredo over the last 12 months and rose $2.59 billion at Eagle Pass. That’s close to one for one.
It reads like what it is: railroads rebalancing their networks. CPKC runs the Laredo rail bridge; Ferromex and Union Pacific connect at Piedras Negras-Eagle Pass. When a manufacturer’s logistics team re-bids a lane, unit trains move from one gateway to the other in a single contract cycle.
The 6-digit codes say what actually moved. Gasoline light trucks, the Silverado class, shifted from one bridge to the other. Medium-duty diesel trucks went from almost nothing at Eagle Pass to $3.6 billion, a lane that didn’t exist a year ago. Diesel light trucks fell at both bridges at once, a pattern that repeats with cars below.
The geography backs the routing story. GM’s Silao plant loads Silverados onto Ferromex track, and that traffic moves via the Eagle Pass gateway. The commercial-truck plants sit on the same corridor: Daimler builds Freightliners in Saltillo, about 3 hours from Piedras Negras, and Navistar has built trucks outside Monterrey since 1998. Union Pacific, which owns a quarter of Ferromex, spent 2025 raising the gateway’s throughput by moving the crew swap off the international bridge to its yard 7 miles inside Texas. For a plant on Ferromex rails, Eagle Pass keeps the haul on allied track end to end.
Cars are a different story. Passenger vehicle imports (HS 8703) fell at both crossings, $2.14 billion at Laredo and $0.88 billion at Eagle Pass. A decline that hits every gateway at once points past routing to policy: the Section 232 auto tariff, in effect since April 2025, working through Mexico-built sedans sector-wide.
The third mover is grain. Corn exports to Mexico through Eagle Pass rose 36% while the McAllen-Hidalgo gateway lost more than half of its corn traffic. Grain matters for train counts far beyond its dollar value: a loaded corn train is worth roughly $2 to $4 million, compared with $25 million or more for a train of finished vehicles. Bulk moves the train counter; it barely moves the trade ledger.
The number that didn’t fit
Here’s where the story turned. If you only watched the rails, you’d expect Laredo’s trade totals to be shrinking. They’re doing the opposite: imports through Laredo rose $20.3 billion, up 9.4%, over the same 12 months.
The composition explains the apparent contradiction. What declined at Laredo is the rail basket: cargo trucks, cars, steel. What grew is machinery, up $22.7 billion, and electronics, up $5.3 billion, and those categories cross on trucks.
The port’s volume held. The mix moved from the rail yard to the highway.
The trailer test
That raised the question we found most interesting: what’s changing inside the trucks doing the hauling? (The tractor-trailers crossing the bridge, that is, not the cargo trucks riding the rails a section ago.) Laredo’s truck counts peaked in 2024 at about 252,000 a month and have eased since, while values keep climbing. Two explanations compete: inflation, or fuller trucks. We tested both against 8 years of data.
Inflation first. Deflated by the import price index, value per truck is up 48.5% in real terms since April 2018. Most of the gain survives the deflator.
If anything, that understates it. The all-commodity index rose 16.1% since 2018, driven up by fuels, which rose 44.7%. Prices for imported capital goods rose by 10.2% over the same 8 years, while consumer goods rose just 3.4%. The categories growing at Laredo are the ones whose prices barely moved; deflate the mix by its own categories and the real gain gets larger, not smaller.
Then weight, from the TransBorder freight files that record both value and shipping weight for every truck-borne import. The average trailer crossing at Laredo carried 9,738 kg of cargo in April 2018 and 9,415 kg this spring, 3.3% lighter.
That leaves one arithmetic possibility, and it’s the finding of the whole exercise: real value per kilogram is up 53.6% since 2018, from $4.55 to $6.99 in constant dollars. It has risen every single year since 2020.
The same trailer, at the same weight, crosses with cargo worth half again as much as it carried 8 years ago. That’s the nearshoring signature in physical form: the freight mix tilting toward machinery and electronics, the categories where a kilogram is worth the most, and away from freight that’s heavy and cheap.
It also says something about how we measure border trade. Crossing counts measure traffic. Value density measures what a corridor is becoming.
By the traffic measure, the border had a quiet year. By the density measure, it’s in the steepest 2-year climb the series has shown.
What to watch
Three things will tell us whether these trends hold. The monthly TransBorder releases will show if value density keeps climbing or 2026 turns out to be a tariff-distorted spike. The truck lanes will show whether the rail rebalancing is a contract cycle or a permanent network change. And the 232 auto review will determine how much of the car decline is reversed.
The bridges aren’t going anywhere, and neither is the freight. What’s changing is what’s inside the boxes, and that’s the number worth following.