Intermodal spot rates are running $1.16 to $1.39 per mile. Truckload spot rates are sitting near $2.80 to $3.05 per mile, the highest level in four years. That gap is the widest it has been in years, and it is pulling chemical shippers toward rail in numbers we have not seen since before the pandemic. North American intermodal volume rose about 6% year over year in May alone.
For most freight, that math is simple. Move it to rail, bank the savings, move on.
The Rate Spread Doesn't Tell the Whole Story
Here is what the rate spread does not show you. Hazmat freight does not route through every rail ramp. A chemical lane that looks intermodal ready on a spreadsheet often runs into a ramp with no permitted drayage pool for the classification you are shipping, which means the savings lane needs a drayage solution that does not exist yet.
Then there is the transload. Every time chemical freight moves from truck to rail and back, it crosses a transfer point, and every transfer point is a chance for contamination, a chance for a claim, and a chance for a customer audit finding that shuts the lane down entirely. Dry van freight tolerates a rough transload. Chemical freight, particularly anything food grade or high purity, often does not.
Equipment is the next constraint. ISO tanks and tank cars are not sitting idle waiting for new volume. The specialized equipment chemical shippers need for intermodal moves is already committed in most markets, and shippers who assume they can shift volume to rail on 30 days notice find out otherwise when the equipment simply is not there. The global ISO tank fleet is growing, but growth in the total fleet does not mean growth in the specific tanks certified for your product on the specific ramp you need. Chemicals already account for more than 60% of ISO tank cargo, which means the shippers competing for that equipment are drawing from the same pool you are.
Finally, there is dwell time. Truckload delivers on a schedule you can set your production line to. Rail delivers on a schedule with more variability built in, and a day or two of dwell on a lane feeding a continuous process line is not a minor inconvenience. It is a shutdown.
None of this means chemical shippers should avoid intermodal. It means the decision cannot be made the way a dry van shipper makes it: chase the rate, convert the network, capture the savings. Chemical freight requires a different test, one that most shippers are not applying, and that gap is exactly where the savings turn into losses.
What Actually Separates Winners from Losers
The insight most chemical shippers miss is not about the rate spread. It is about what sits behind the rail lane once you commit to it.
The shippers getting real, durable savings from intermodal are not the ones who moved lanes to rail. They are the ones who kept qualified truckload capacity standing behind every rail lane they use, priced and bookable within hours, not as a theoretical backup buried in a contract but as a live option their carrier can execute the same day service slips.
That distinction changes what intermodal actually is for a chemical shipper. It is not a replacement mode. It is a conditional mode, one that only pays off if the fallback behind it is real. A rail lane with no truckload capacity standing behind it is not a savings lane. It is a liability waiting for the first bad dwell day, the first ramp closure, the first tank car shortage that hits at the wrong time.
This is why the same rate spread produces completely different outcomes for two shippers on the same lane. One treats the intermodal move as final and finds out the hard way what happens when rail underperforms on a hazmat lane with no drayage backup. The other treats the same move as conditional, with a truckload carrier who already knows the lane, already holds the hazmat certifications, and can step in without a scramble.
The rate spread does not reward the shipper who converts the most lanes to rail. It rewards the shipper who builds the fallback first and only takes the savings on lanes where that fallback is real. That is a harder discipline than watching a rate index, and it is the entire difference between a lane that pays off and a lane that becomes a liability.
A Lane Scoring Method That Works
Building that discipline starts with a lane inventory, not a rate comparison. Score every candidate lane on four factors before it goes anywhere near rail.
First, hazmat classification and ramp access. Confirm the specific ramp serving that lane is permitted for your classification and has a drayage pool that can actually move your freight, not a pool that exists on paper.
Second, transload exposure. If the lane requires a transfer point, quantify the contamination and claims risk for that specific product. A high purity or food grade product carries a different risk profile than a bulk industrial chemical, and the lane decision should reflect that difference explicitly. Pull the claims history on that lane, not just the rate. A lane with a clean transload record for the last twelve months is a different bet than one with a single unresolved contamination claim sitting in your carrier's file.
Third, dwell tolerance against your production schedule. Ask the specific question: how many hours of schedule slip can this production line absorb before it costs money? If the answer is measured in hours rather than days, that lane is not a rail candidate yet, regardless of the rate spread.
Fourth, equipment availability. Confirm ISO tank or tank car capacity is committed before you commit volume, not after the rail booking is already made.
Only after a lane clears all four should you weigh the rate spread at all. And every lane that clears still needs a truckload carrier already qualified on that lane's hazmat requirements, contracted and ready to execute same day, not sourced after the rail lane already slips.
This is not a one time exercise. Rates move, ramp access changes, and equipment supply shifts by quarter. The shippers capturing intermodal savings without exposure are rescoring their lane list every quarter, not locking in a network decision and walking away from it.
Why the Window Is Open Now
The timing pressure behind this decision is real. Truckload spot rates are near their highest point in four years. Tender rejections are running close to 14%, a level not seen consistently since the capacity crunch of 2022, which signals truckload capacity is tightening broadly even as rates climb. Intermodal volume is up roughly 6% year over year, and shippers across the industry are moving in that direction to offset rising truckload costs. This is the same shift that has drawn broader financial press coverage in 2026, as reporters covering the freight market have flagged truckload rates climbing toward multi-year highs while intermodal lags behind on price.
That arbitrage window is real. It is also uneven, lane by lane, and it will not stay open indefinitely. As more freight shifts to rail, ramp congestion and equipment demand will follow, and the lanes that look attractive today may not clear the same test in six months.
Regulatory scrutiny on hazmat routing and chain of custody is also increasing, which raises the cost of getting the transload and drayage pieces wrong. A shipper that treats every rail ready lane the same, without accounting for hazmat classification and production schedule tolerance, is building exposure into its network at exactly the moment scrutiny is rising.
The shippers who build lane-by-lane discipline now, while the rate spread is wide and the incentive to act is strong, will capture savings that hold up under audit and under a bad dwell week. The shippers who convert their network wholesale because the rate spread looks too good to pass up will find the one lane that does not work, and it will cost more than the savings the rest of the network delivered.
This is the moment to build the discipline, not after the first claim hits.
The Real Question
Stop asking whether your network should move to intermodal. That question invites a network-wide answer, and chemical freight does not have a network wide answer.
Ask instead which lanes have earned it. Which lanes clear hazmat and ramp access. Which lanes can tolerate the dwell time your production schedule allows. Which lanes have the equipment committed and a truckload carrier ready to step in the same day rail underperforms.
The rate spread is not going anywhere soon, and neither is the temptation to chase it network wide. The shippers who win this cycle will not be the ones who moved the most freight to rail. They will be the ones who moved the right freight, lane by lane, with a real plan for the day rail does not deliver.
That is not a smaller ambition. It is the only one that holds up.
About the Author
Nicholas Shipe is Director of Premium Transportation at Circle Logistics, where he oversees time-critical and specialized freight movements, including hazmat and chemical shipments, across North America.
