Intermodal transport moves goods with two or more modes (for example truck + rail + vessel) using the same load unit — usually a container or other intermodal transport unit (ITU/UTI) — without opening or repacking the goods between modes. In Mexico that shows up from Manzanillo, Lázaro Cárdenas, and Veracruz inland, and at the Mexico–US border when the unit changes mode without breaking the lot.
- modes + same ITU
- ≥2
- TEUs Mexico ports 2025
- ~9.53 M
- rail import via Veracruz+Manzanillo
- 71%+
- docs joined per leg
- 1 file
What intermodal transport is
In yard language: intermodal is when the container (or ITU) jumps from truck to train, train to vessel, or vessel to truck, and the goods are not re-picked at each change. The tractor, railcar, or ship changes — not the load unit.
That differs from a loose “multi-vendor trip” where freight is floor-unloaded, repacked, or reconsolidated. It also differs from a single mode (truckload only) even if the move crosses states.
Mexico scale context: per Secretaría de Marina figures covered by T21 / TyT, ports moved about 9.53 million TEUs in 2025. Always calibrate with your terminal, customs broker, and the Mexican Transport Institute (IMT).
Intermodal vs multimodal
Online definitions contradict each other: some copy the European contractual emphasis (multimodal transport); others use the US operational habit (intermodal = container on rail + truck). For Mexico–US operations, use this practical split:
Load unit
- ≥2 modes with the same sealed ITU
- No unpacking goods between modes
- May have several contracts (ocean + rail + truck)
- Key question: does the box travel intact?
Contract and owner
- ≥2 modes under one plan / one owner facing the customer
- Focus is orchestration and end-to-end OTIF
- Cargo *may* change unit if the contract allows (less clean)
- Key question: who answers when the handoff fails?
Related: operable definition of multimodal transport and the shipment object that joins legs.
Common mode combinations
Not every mode pair is equal. Choose by distance, delivery windows, ramp capacity, and whether cargo tolerates rail or ocean transit.
Vessel + truck
When to use it: Import/export FCL to plant or DC without a nearby rail ramp
Watch-out: Port demurrage/detention + Carta Porte on the MX leg
Vessel + rail (+ truck last mile)
When to use it: Stable volume port–Bajío/north; you want cost per TEU
Watch-out: Train slots, yard dwell, unload appointments
Rail + truck
When to use it: Long domestic corridors or border with an intermodal ramp
Watch-out: Mis-priced first/last mile “eats” the savings
Barge / coastal + truck
When to use it: Coastal or river flows with regular service
Watch-out: Low frequency; document every leg
Air + truck
When to use it: High value or urgency; air is rarely a classic ISO container
Watch-out: More contractual multimodal than ocean ITU; AWB + road
How it works step by step
A typical ocean import into inland Mexico (or the export mirror) reads as a stack of legs: the ITU leaves the vessel, hits the yard, moves by rail or truck, and closes at the plant.
ITU chain
From factory to last mile
Factory / DC
Load the ITU
First-mile truck
To port or ramp
Port / vessel
Ocean transit
Rail or truck
Inland move
Last mile
Plant delivery
- 01
Booking and B/L
Space, cutoff, and bill of lading for the ocean leg.
- 02
Customs entry
Broker + value docs; do not confuse with Carta Porte.
- 03
Rail leg (if any)
Railroad waybill/docs + ramp milestone.
- 04
CFDI + Carta Porte
Mexico trucking when the move requires it — see Carta Porte.
- 05
POD at destination
Proof of delivery (POD) tied to the shipment ID.
How it applies in Mexico
The Mexico angle is operational: the three big container nodes —Manzanillo, Lázaro Cárdenas, and Veracruz— feed the Bajío, the industrial north, and the Mexico–US crossing. In 2025 Manzanillo led with ~3.89 M TEUs, Lázaro ~2.62 M, and Veracruz ~1.30 M (Semar via T21/TyT).
Manzanillo
Intermodal role: Highest Pacific TEU volume; truck and rail inland
What to watch: Congestion, dwell, and rail slots
Lázaro Cárdenas
Intermodal role: TEU growth + rail connectivity northbound
What to watch: Terminal capacity and outbound appointments
Veracruz
Intermodal role: Gulf + heavy share of imports that transfer to rail
What to watch: Vessel windows vs inland ramp
MX–US border
Intermodal role: Intermodal ramp / transfer / through-trailer by lane
What to watch: Appointment, entry docs, and different papers per side
On Mexican highways the Comprobante Fiscal Digital por Internet (CFDI) with Carta Porte documents the move for SAT. On ocean, the bill of lading (B/L) rules. Mixing them into one generic PDF is the expensive accounts-payable mistake.
To orchestrate legs in a transportation management system (TMS), also measure yard wait mudas (lean supply chain) and KPIs for dwell, OTIF, and cost per TEU/km.
Main documents
A confident list of main documents — not a 40-annex inventory. If one of these is missing on its leg, the “intermodal” trip goes blind in the tower and in accounts payable.
Elige un paso para ver el detalle
Detalle del paso · 01
Bill of lading (B/L)
Go deeper on the B/L in what is a bill of lading and on the tax complement in what is Carta Porte.
Decision factors
Before signing “intermodal because it is cheaper,” run these four filters. If one fails, long-haul savings get eaten by detention, dry runs, or broken OTIF.
Cost vs transit
Operable question: Does TEU/km savings justify extra days?
If the answer is weak: Stay on truck or renegotiate cutoff
Cargo type
Operable question: Can it tolerate vibration, temperature, and yard dwell?
If the answer is weak: Reefer, hazmat, or high value may need another design
Infrastructure
Operable question: Is there ramp, slot, and equipment for your ITU?
If the answer is weak: Without a nearby ramp, “cheap rail” is disguised trucking
Visibility
Operable question: Do you see vessel, ramp, and land GPS milestones?
If the answer is weak: Without a per-leg file, you buy blind
OCL and the trip file
OCL Cargo is an autonomous TMS with agents: it does not sail ships or dispatch trains. On an intermodal trip it covers what usually breaks on land: visibility and trip file for the road leg (appointment, GPS, POD), match against rate, and — when applicable — stamping invoices and Carta Porte. Your team decides exceptions. It coexists with your system of record.
Key takeaways6 points
- Intermodal = ≥2 modes + the same ITU/container without repacking goods between modes.
- Multimodal answers “who owns the trip for the customer?”; intermodal answers “does the unit travel sealed?”.
- Mexico ports 2025: ~9.53 M TEUs; Manzanillo ~3.89 M, Lázaro ~2.62 M, Veracruz ~1.30 M (Semar / trade press).
- Main docs: B/L (ocean), AWB (air), CFDI + Carta Porte (Mexico road), railroad docs — one file, not three chats.
- Decide with cost vs transit, cargo type, ramp/port infrastructure, and visibility per leg.
- OCL joins land legs into the trip file and can stamp invoices and Carta Porte; it does not replace ocean or rail carriers.
Do your intermodal legs live in one file — or three chats?
Frequently asked questions
Moving goods with two or more modes (truck, rail, vessel, barge…) while keeping the same load unit — a container or other intermodal transport unit (ITU/UTI) — without unpacking the goods between modes.
No. Intermodal stresses the physical unit (sealed ITU). Multimodal stresses the contract / owner facing the customer (one plan, one responsible party). They can overlap: an intermodal move can be sold as multimodal. See multimodal.
Ocean: bill of lading (B/L). Air (if any): air waybill (AWB). Mexico highway: Comprobante Fiscal Digital por Internet (CFDI) with Carta Porte when the leg requires it. Rail: the railroad’s waybill/docs. Each mode has its document; the trip file must join them.
Yes in practice: ocean gateways into the interior by rail and truck. In 2025 Mexico’s ports moved ~9.53 million TEUs (Semar / T21–TyT coverage). Veracruz and Manzanillo concentrate much of the import cargo that transfers to rail — calibrate with your terminal and ATTRAPI/IMT.
No. The B/L governs the ocean leg (contract, on-board receipt, release). Carta Porte documents the Mexico road move for the tax authority (SAT). On one intermodal shipment they usually coexist.
When volume and distance amortize the handoff (port–Bajío/north corridors, or border with an intermodal ramp), cargo tolerates longer transit, and ramp capacity exists. If the OTIF window is tight or the ITU does not fit the rail service, door-to-door truck wins.
OCL does not run vessels or trains. It joins milestones and documents per leg in one trip file (land visibility, CFDI/Carta Porte when applicable). OCL can stamp invoices and Carta Porte. Your team decides exceptions.