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Paris is currently undertaking the Grand Paris Express project, a €35 billion infrastructure programme adding 200 km of new metro lines and 68 stations by 2030. This unprecedented expansion demands thousands of precision rail welds, making thermit welding solutions an essential component of the city's construction pipeline.
The SNCF mainline network and the RER commuter rail system — among the busiest in Europe — require continuous track maintenance and rail joint renewal. Aluminothermic welding is the industry-standard method for in-situ rail joint repair across these high-frequency corridors, ensuring seamless, safe operations for millions of daily passengers.
Paris and its surrounding industrial zones — including the logistics hubs along the Seine and the Roissy-CDG freight corridors — rely on crane rails and heavy-duty industrial track systems. These environments demand robust welding materials capable of withstanding heavy loads, vibration, and continuous operational cycles.
Paris has committed to becoming a carbon-neutral city by 2050. Expanding and maintaining rail infrastructure is central to this vision — reducing road traffic and emissions. High-quality, long-lasting rail welds directly contribute to reduced maintenance frequency and a lower carbon footprint over the infrastructure lifecycle.
Paris operates one of the most extensive tram networks in Western Europe, with lines T1 through T13 circling the city's périphérique. Ongoing extensions and renewals of tram tracks in dense urban environments require compact, efficient welding equipment and materials that minimise disruption to street-level traffic.
Rail welding in France must comply with EN 14730 (aluminothermic welding of rails) and SNCF internal technical specifications. RMTS products are engineered to meet and exceed these European standards, providing Paris-based contractors and rail authorities with the confidence needed for certification and project approval.
RMTS is a manufacturer specializing in railroad thermit welding materials, based in Tianjin, China. With a factory spanning 5,500+㎡ and 30+ professionals dedicated, we are committed to delivering reliable and efficient thermit welding solutions to clients across the globe. Our products are designed to meet the highest industry standards, ensuring durability and performance in various applications.
We understand that successful welding projects require not only high quality products but also expertise and knowledge. That's why we offer comprehensive on-site training programs to help our clients master the thermit welding process, enabling them to achieve optimal results and build a strong reputation in their respective fields. Additionally, our experienced team provides project welding instruction services, offering hands-on guidance and support to ensure seamless execution, no matter where the project is located.
Driven by a customer-centric approach, RMTS is dedicated to fostering long-term partnerships by delivering exceptional products and services tailored to the unique needs of our clients. Whether you are looking for reliable thermit welding materials, expert training, or project support, RMTS is your trusted partner in achieving welding excellence.
The European rail industry is increasingly demanding next-generation thermit welding compounds that deliver faster ignition times, lower slag generation, and superior metallurgical bonding. RMTS continuously invests in R&D to develop formulations that align with the latest EN 14730-1 and EN 14730-2 standards, ensuring compatibility with UIC 60, 54E1, and other rail profiles commonly used across the French network.
Digitally controlled preheating systems and automated mould positioning devices are transforming rail welding workflows in Paris and across Europe. These innovations reduce human error, improve repeatability, and accelerate project timelines — critical factors in the time-sensitive, high-traffic environments of the Grand Paris Express construction sites.
In line with France's environmental regulations and the EU Green Deal, rail contractors in Paris are prioritising welding consumables with reduced particulate emissions and recyclable packaging. RMTS is actively developing eco-optimised product lines to meet these evolving procurement criteria from RATP, SNCF Réseau, and Île-de-France Mobilités.
Paris rail operators are adopting IoT-based track monitoring systems that identify weld fatigue and joint degradation in real time. This trend increases demand for high-precision initial welds — because a superior thermit weld extends the interval between maintenance interventions, reducing lifecycle costs and service disruptions on the busiest lines in Europe.
Post-pandemic supply chain disruptions have prompted Paris-based rail contractors to diversify their supplier base beyond traditional European sources. Asian manufacturers like RMTS — offering competitive pricing, certified quality, and responsive logistics — are increasingly integrated into European procurement strategies as reliable secondary or primary suppliers.
RMTS have a highly skilled R&D team that works tirelessly to ensure that we produce thermit welding materials that meet the specific needs of each type of rail — from standard UIC 60 profiles used on French mainlines to specialised crane rails in industrial facilities around Paris.
In addition to its strong R&D capabilities, RMTS actively participates in railway projects across China and abroad. The company collaborates with railway authorities, construction companies, and maintenance organizations to provide its expertise and materials for various projects — including metro expansions and tram renewals comparable to those underway in Paris.
By participating in railway projects, RMTS contributes to the development and maintenance of extensive railway networks globally. Whether in high-speed rail, urban transit systems, or conventional rail lines, RMTS offers its thermit welding materials and services to ensure the integrity and safety of the rail infrastructure — standards that fully align with European EN requirements.
Furthermore, RMTS maintains partnerships with research institutions, universities, and industry experts in China. These collaborations enable RMTS to continuously strengthen its R&D capabilities in thermit welding technologies, driving innovation that benefits clients in Paris and across the European rail sector.
As part of the Phase 2 expansion of Jakarta's Mass Rapid Transit (MRT) system, RMTS was contracted to provide aluminothermic welding solutions for the new underground and elevated tracks. The project involved welding 600 rail joints across a 12-kilometer stretch, connecting key areas of the city to reduce traffic congestion.
Our team worked closely with PT MRT Jakarta to ensure the welds met international safety standards. The project was completed on time, and the new line has been operating smoothly since its launch. Jakarta MRT officials highlighted the durability of the welds, which have withstood the high frequency of train movements and tropical weather conditions.
This project demonstrates RMTS's capability to deliver metro-scale welding solutions — directly applicable to Paris's Grand Paris Express expansion.
The client faced the challenge of welding materials of T62 and P65 rails. The welding process needed to meet the rigorous standards set by the railway authorities, ensuring optimal track performance, longevity, and safety.
Our team collaborated closely with the client, thoroughly understanding their specific requirements. We provided them with our high-quality thermit welding materials, including welding kits, tailored to suit the T62 and P65 steel rail specifications.
The client expressed utmost satisfaction with our thermit welding materials. They acknowledged the superior quality, reliability, and technical support provided by our team. Our materials played a crucial role in enabling them to deliver high-quality rail construction projects and meet the demands of the railway industry.
KTMB Railways aimed to improve connectivity across the city's suburbs. RMTS became the most trusted supplier with 1,000 aluminothermic welding materials for the new tracks, which included both underground and elevated sections. The project required precise welding to ensure smooth and safe operations, which serves millions of passengers annually.
RMTS's welding materials were chosen for their ability to create strong, seamless joints that could withstand the humid climate and heavy usage. The project was completed ahead of schedule, and the new line has significantly reduced travel times for commuters.
The scale and complexity of this project mirrors the requirements of Paris tram and suburban rail renewal programmes.
RMTS's strong R&D abilities, coupled with its involvement in railway projects across Asia, Europe, and beyond, demonstrate the company's commitment to providing advanced thermit welding solutions that meet the specific demands of the railway industry — including the rigorous requirements of Paris's expanding rail networks.
For rail contractors, maintenance organisations, and infrastructure authorities operating in Paris and the Île-de-France region, RMTS offers a comprehensive partnership: certified welding materials, expert on-site training, project consultation, and responsive after-sales support — ensuring every rail joint performs to the highest standard for decades to come.
RMTS offers fully customised thermit welding kits, mould designs, and consumable packages tailored to specific rail profiles, project environments, and regulatory requirements in France and across Europe. Contact our technical team to discuss your Paris-based rail welding project requirements.
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