Stimio
Stimio is a French supplier of railway Internet of Things (IoT) devices and predictive maintenance software, headquartered near Nantes and serving operators and infrastructure managers in France and Luxembourg, with an additional office in Germany.
Founded in 2014, Stimio is based in Carquefou outside Nantes. The company reported more than 30 employees in 2021, when it raised EUR 1.7 million in growth capital.
Since July 2023, Stimio has been owned by CBM, a privately held French supplier of spare parts for buses, coaches, and trams. It trades as Stimio by CBM and brought digital systems and software into a group otherwise built on parts distribution.
Core products
Stimio combines railway-certified, battery-powered sensing hardware with a cloud analytics platform. The Railnode device collects condition data from rolling stock and infrastructure, while the Railnet gateway connects onboard sensors and existing train equipment.
Data is processed in the Oxygen software suite, spanning Oxygen Edge for acquisition and Oxygen Cloud for storage, visualisation, and prediction. Like other predictive maintenance platforms, Oxygen applies machine learning models to forecast failures and support condition-based maintenance planning.
Typical rolling stock applications include compressors, doors, battery voltage, pneumatic circuits, and sanding systems. On the infrastructure side, the company monitors catenary tensioning, rail temperature, track geometry, and signalling cable insulation.
Market position
By 2022, Stimio’s customer base was anchored in the French rail market and included SNCF, Transdev, RATP, and Keolis, alongside Luxembourg’s national operator CFL. In March 2021, the company signed a five-year framework contract with SNCF Voyageurs covering the supply of more than 12,500 connected IoT devices.
Infrastructure customers over the same period included Lisea and Mesea, the concession and maintenance companies behind the Tours–Bordeaux high-speed line, and Eiffage Rail Express, the concession company behind the Bretagne–Pays de la Loire high-speed line.
Stimio has also worked for the French energy sector, for the distribution operator Enedis and for Réseau de Transport d’Électricité (RTE), the national electricity transmission operator.
Stimio stated in 2021 that it had deployed more than 10,000 certified sensors across its customer base. The company has exhibited at InnoTrans in Berlin and SIFER in Lille.
Ownership and partnerships
The CBM acquisition followed a commercial partnership established in 2022, which combined Stimio’s condition monitoring with CBM’s spare parts distribution in a joint predictive supply chain offering. As of mid-2026 the company operates inside the group under the Stimio by CBM name.
In 2022, Stimio partnered with German gearbox manufacturer GGT Gmeinder Getriebetechnik to integrate the GGT-GearSaver oil-condition sensor into its platform, extending predictive coverage to railway gearboxes.
