Understanding which convention applies requires knowing the rail route's geography:

• CIM territory: The 50+ COTIF member states, including all EU member states, the United Kingdom, Switzerland, Norway, Turkey, Tunisia, Morocco, and others. CIM governs rail consignments where both origin and destination are in COTIF states.
• SMGS territory: The 29 OSJD member states, including China, Russia, Kazakhstan, Uzbekistan, Turkmenistan, Kyrgyzstan, Tajikistan, Mongolia, Vietnam, Laos, Iran, and others. SMGS governs rail consignments within this network.
• Overlap states: Several countries (Poland, Czech Republic, Slovakia, Hungary, Romania, Bulgaria, the Baltic states, and others) are members of both COTIF and OSJD, meaning both CIM and SMGS can apply depending on routing.

For the China–Europe corridor, goods typically originate under SMGS in China, transit through Kazakhstan and Russia (both SMGS), cross into Poland or the Baltic states (dual membership), and terminate in a CIM-only state such as Germany or France. The combined CIM/SMGS note eliminates the need for re-consignment at the SMGS/CIM boundary.

For the China–ASEAN corridor, the China–Laos Railway (opened December 2021) and the planned extension to Thailand create a route entirely within SMGS territory (China, Laos) extending into a country (Thailand) that is not yet a member of either OSJD or OTIF, raising unique documentation questions that KabyTech helps address.

The combined CIM/SMGS consignment note was jointly developed by OTIF and OSJD and entered service in 2006. It is a single sheet (with additional continuation sheets as needed) that carries all data fields required by both conventions, enabling a shipment to travel from origin to destination without documentary re-consignment.

Key features of the combined document include:

• Dual legal basis: The header explicitly states applicability under both CIM (COTIF Appendix B) and SMGS. The applicable convention at any point in transit depends on the territory the train is currently in.
• Harmonised field layout: Fields are numbered 1–62 and cover sender, consignee, route, commodity description, weight, wagon number, container number, customs data, and payment instructions.
• Field-mapping differences: Some fields have different meanings or requirements under CIM vs SMGS. For instance, the dangerous goods declaration (field 22) follows RID (European) rules in CIM territory and SMGS Annex 2 rules in SMGS territory, even though the physical field is the same.
• Multi-language support: The note is typically completed in two languages: the language of the country of departure and one of the official OSJD/OTIF working languages (Russian, Chinese, German, English, French).

KabyTech's rail-document parser recognises both standalone CIM consignment notes, standalone SMGS consignment notes, and combined CIM/SMGS documents. It automatically identifies the document type from header markers and applies the appropriate field map.

The China–Laos Railway (Kunming–Vientiane) opened in December 2021 and has rapidly become a major freight artery for China–ASEAN trade. The Mohan/Boten border crossing (China/Laos) is the critical interchange point where Chinese standard-gauge track meets the railway running south through Laos to Vientiane.

Current documentation practices on this corridor include:

• Chinese segment: Goods from Chinese inland cities (Chengdu, Chongqing, Kunming) to Mohan travel under SMGS consignment notes issued by China Railway (CR).
• Lao segment: From Boten to Vientiane (or the Thanaleng dry port near the Thai border), the Laos-China Railway Company (LCRC) issues its own consignment documentation, which follows SMGS conventions but with Lao-specific customs fields.
• Thai segment: Thailand's State Railway (SRT) is not an SMGS member. Goods entering Thailand at Nong Khai require a new domestic rail consignment or are transloaded to truck. The planned Thai–Lao rail bridge upgrade and Bangkok–Nong Khai high-speed extension will eventually require a formal rail convention framework for through-traffic.

KabyTech detects CIM vs SMGS format based on document header analysis, field numbering patterns, and language cues (presence of Chinese characters, Cyrillic script, or European languages). For the China–Laos corridor specifically, KabyTech extracts the Mohan/Boten border-crossing stamp data and validates customs declaration numbers against the Lao ASYCUDA system format.

As Thailand moves toward integration with the China–Laos rail corridor, KabyTech is preparing parsing support for the emerging trilateral documentation that will combine SMGS-origin data with Thai Customs e-Import declarations.

CIM and SMGS are the two major international rail freight conventions, each governing a distinct geographic zone. Key takeaways:

• CIM (COTIF Appendix B) covers European rail freight under OTIF governance; SMGS covers Eurasian rail freight under OSJD governance.
• The combined CIM/SMGS consignment note, in service since 2006, eliminates re-consignment at the CIM/SMGS boundary.
• China–Europe rail freight (16,000+ trains/year) relies heavily on the combined document.
• The China–Laos Railway introduces a new corridor using SMGS conventions, with Thailand's eventual integration still under development.
• KabyTech auto-detects CIM, SMGS, and combined CIM/SMGS documents and applies the correct field mapping and validation rules.

For rail-corridor documentation support, contact KabyTech's logistics integration team or refer to the /parse/rail API endpoint documentation.