The IANA Intermodal Volume Index Gives Shippers an Earlier Mode-Shift Signal

Intermodal is useful long before a dispatcher is forced to choose it.

That is the real value of the IANA Intermodal Volume Index. It gives shippers an earlier read on whether rail-linked capacity is becoming a practical alternative to truckload, before spot coverage failures and budget surprises make the decision obvious.

Logistics Management reported that IANA's July IVI estimate came in at 106.8. That was below June's 107.7 reading, but still the second-highest 2026 reading. The same coverage noted that May intermodal volume rose 4.4% year over year to 1,618,761 units after April declined 0.6%.

Those numbers do not mean every lane should move by rail. They mean transportation teams should stop treating intermodal as a last-minute escape hatch. When volume improves, truckload costs firm, and service-sensitive lanes still have inventory tolerance, the right question changes from "Can rail save money?" to "Which shipments should already be eligible for rail?"

Truckload Pressure Is Reopening the Mode Question

The truckload market is no longer giving shippers the same broad cushion it offered during the freight recession. In a separate Logistics Management outlook, Avery Vise of FTR said combined dry van, flatbed, and refrigerated transport rates were up around 45% year over year, with 2027 truckload contract rates forecast to rise 17% year over year.

That kind of rate movement changes the mode conversation. A long-haul truckload lane that looked convenient at depressed spot prices may look exposed once contract rates reset, diesel moves, driver availability tightens, or customer demand improves. Even if intermodal is not faster, it can become the more disciplined choice when the shipment has the right profile: longer distance, predictable origin and destination, flexible delivery window, reliable dray capacity, and enough inventory buffer to absorb rail variability.

The mistake is waiting until the routing guide fails. By then, planners are negotiating under pressure.

Intermodal works best when it is evaluated before the emergency. A shipper can compare total delivered cost, service promise, fuel exposure, rail cutoff times, destination dray reliability, and inventory impact while there is still room to choose. Once a lane is late, hot, or commercially sensitive, the cheaper mode may no longer be the better decision.

The IVI Is a Trigger, Not a Forecast to Admire

Indexes become valuable when they trigger action. The IVI should not sit in a market newsletter while routing decisions happen somewhere else. It should feed a lane-level review.

That review starts with a simple mode-shift trigger:

• Truckload rate delta versus intermodal all-in cost
• Lane length, origin ramp, and destination ramp fit
• Customer service window and appointment flexibility
• Dray carrier availability at both ends
• Rail cutoff, transit estimate, and recovery plan
• Diesel and fuel surcharge exposure
• Inventory tolerance and stockout risk
• Product value, damage sensitivity, and security requirement
• Contract commitment, accessorial risk, and tender lead time

This list is deliberately operational. Intermodal conversion is not just a procurement exercise. A 12% linehaul saving can disappear if the destination dray leg is thin, the receiving window is rigid, or the shipment misses a cutoff that forces another day of dwell. A more expensive truckload move may still be right when the order is urgent, high-margin, or tied to a customer penalty. The point is to make those tradeoffs visible before someone is making calls from the dock.

Policy and Import Timing Add Another Layer

Mode planning is also being complicated by trade-policy timing and import volatility. FreightWaves reported that container import bookings are being influenced by uncertainty around proposed tariffs, with July 24 emerging as an important date for freight planners watching policy clarity.

That matters for intermodal because import surges and pauses do not hit transportation modes evenly. A frontloaded ocean container may need fast truckload recovery if it arrives late against a tariff deadline. A replenishment shipment with more inventory slack may be a better candidate for inland rail. A supplier order tied to uncertain duty treatment may need mode optionality held open until the commercial decision is clearer.

In other words, the mode-shift signal is no longer just "truckload is expensive." It is also "this order's timing, duty exposure, customer promise, and inventory position determine whether intermodal is available."

That is why shippers need shipment-level rules, not generic mode policies. A blanket rule that says "use rail over 750 miles" will miss the real constraint. So will a blanket rule that says "use truckload for all customer-facing freight." The better rule considers cost, service, compliance timing, and inventory condition together.

Build Mode Optionality Into the Planning Record

Intermodal planning should live inside the transportation record, not in a separate analyst file. Every candidate lane needs the data required to make the decision repeatedly:

Origin and destination ramp options. Dray carrier coverage. Cutoff calendars. Transit variability. Customer appointment rules. Commodity restrictions. Fuel-surcharge logic. Inventory buffer. Tender lead time. Rail service history. Exception owner. Finance approval thresholds.

Once those fields are visible, the system can start surfacing intermodal before a planner asks for it. If a truckload lane crosses a rate threshold, the system can show the intermodal alternative. If fuel exposure climbs, it can flag lanes with rail fit. If a customer order has two days of delivery flexibility, it can move into a candidate pool. If destination dray coverage is weak, the system can block the recommendation before a planner books a false saving.

That is the practical promise of the IVI. It is not a crystal ball. It is a reminder to wire market momentum into transportation execution.

Where CXTMS Fits

CXTMS helps freight teams turn intermodal from a periodic sourcing project into an executable routing option. The platform can connect shipment data, carrier options, lane rules, service windows, dray requirements, fuel exposure, and exception workflows so planners see rail opportunities before truckload capacity gets expensive.

That matters because mode conversion is rarely one big decision. It is a series of small lane-level calls made under changing conditions. The teams that win are not the ones that know intermodal volume improved after the fact. They are the ones whose routing logic already knows which shipments can move differently when the signal changes.

If your team is trying to control truckload exposure, evaluate intermodal lanes, and make mode decisions with current shipment data instead of spreadsheet archaeology, schedule a CXTMS demo. We will show how routing rules, market signals, and exception workflows can turn mode optionality into a working part of transportation execution.