What is blockchain?
Blockchain can be thought of as a shared digital logbook that all parties involved in a supply chain can access. This logbook stores all information—for example, on the manufacture, storage, delivery, or maintenance of a spare part—in chronological order and in an unalterable form.
For spare parts supply in the railway industry, this would mean that:
Every spare part can be documented throughout its entire life cycle. Once information has been entered, such as the origin of a component or maintenance carried out, it cannot be changed or deleted later without being noticed.
Since this logbook is not centrally located at a single company but decentralized among all partners involved, everyone works with the same database. Misunderstandings, duplicate data maintenance, or missing information are reduced.
Especially in the supply of spare parts for railways – with long service lives, high safety requirements, and many parties involved – blockchain can create transparency, trust, and traceability: it is possible to see at any time where a part comes from, where it is located, and what condition it is in.
Spare parts trade in the railway industry
The spare parts trade in the railway industry is complex. As already mentioned, railway parts have very long life cycles – trains are typically operated for over 30 years, and components can remain in use for decades. Many players are involved in this process: manufacturers and suppliers (often spread across the globe), maintenance companies, transport companies, and railway operators. Each component must remain traceable throughout its life cycle and usually be available around the clock. These complex, international supply chains and high availability requirements make spare parts management particularly challenging.
Current challenges
Today, there are often considerable problems in the spare parts trade:
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Low transparency and visibility: Information about inventory and delivery status is scattered across many participants. Delayed data updates and a lack of coordination lead to bottlenecks or excess inventory.
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Traceability and documentation: Often, there is a lack of complete audit trails for maintenance, inspections, and parts origin. Paper-based or siloed documentation hinders quick decisions, e.g., in the case of recalls or warranty claims.
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Time delays due to media discontinuity: Manual processes, lack of standard IT connectivity, and complex approvals lead to lengthy coordination. This causes delays when spare parts are urgently needed.
How blockchain can help – possible approaches
Blockchain technology could offer several solutions to these challenges:
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Digital twins of components: Each component is assigned a unique identifier in the blockchain. Changes to the part (e.g., installation, repair, replacement) are recorded in the “digital twin” in a tamper-proof manner. This creates a complete product history: It is possible to trace at any time which change was made to which component and when. In the event of damage, the required replacement part can be automatically determined, and the installation of the new part is also documented in the digital twin.
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Smart contracts for automation: Intelligent contracts can trigger business processes automatically. For example, a smart contract could automatically release payments as soon as a spare part has been delivered and properly installed. Maintenance orders could also be processed automatically in this way (e.g., approval of maintenance as soon as certain sensor values are reached). This reduces media breaks and makes payment transactions significantly faster and more secure.
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Confidential supply chain and protection against counterfeiting: Due to the decentralized nature of a blockchain, all participants in a consortium blockchain must be included, and every data record is visible to everyone and cannot be changed. This means that proofs of origin and test certificates for a part can be stored in a tamper-proof manner. This could achieve a high level of protection against counterfeiting without the need for a central authority.
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Track & trace and transparency: A blockchain system can serve as a shared platform where all suppliers, logistics providers, and operators can always see the same current status. This means that it is possible to see where each part is located at any time. Blockchain-based applications for track & trace make it possible to track products transparently along the entire chain. In conjunction with RFID (radio frequency identification) or sensors, railway parts could be automatically documented with every movement, avoiding misclassifications and duplicate entries.
Pilot projects and standards in the railway industry
To date, there are only a few concrete blockchain projects in the rail sector. One well-known example is the "RailChain" project (funded by the Ministry of Transport), which developed a blockchain-based legal recorder - a digital black box for trains that can record operating and safety data in a tamper-proof manner. Apart from such research initiatives, cross-industry applications are rare. In 2020, the Federal Network Agency in Germany noted that there are hardly any real blockchain projects in the railway sector (except at Deutsche Bahn). Although digital tickets, revenue sharing, and secure train signals are being discussed as possible use cases, there are currently no uniform standards for blockchain in the railway sector. Instead, the focus is on generic supply chain standards (such as GS1/EPCIS) and the industry's existing digitization programs.
The “but”: The current problems
As great as the potential of blockchain technology is, its use in the supply of spare parts for the railway industry still faces several hurdles.
One key issue is data protection: much of the information involved in spare parts supply is sensitive, such as data on suppliers, prices, maintenance intervals, or safety components. A technology based on transparency and shared data usage must be carefully reconciled with legal requirements such as the GDPR and internal company confidentiality interests.
Added to this is a lack of standards and interfaces. The rail industry has grown historically and is highly fragmented, with different IT systems, data formats, and processes. For a blockchain to function effectively, many players would have to agree on common rules, data models, and responsibilities, which is time-consuming and resource-intensive in practice. Added to this is the economic cost. The introduction of a blockchain solution means investing in IT infrastructure, integration into existing systems, and training employees.
Last but not least, there is a lack of proven large-scale applications. Many concepts work in pilot projects or theoretical models, but have not yet proven themselves in the daily operation of a complex spare parts supply chain.
Vision or soon reality?
The widespread use of blockchain in the railway spare parts trade is still a visionary concept at present. Critical hurdles stand in the way of rapid implementation: high investment and operating costs, technical complexity, and scalability are key challenges. Data protection and regulatory issues in particular remain unresolved—the transparency of a blockchain often conflicts with confidentiality and GDPR requirements. Furthermore, there are still no cross-manufacturer data models or interfaces for such systems. Experts believe that blockchain will only become a reality once industry partners have established common standards. Until then, the technology is likely to mature only gradually in individual pilot applications. Blockchain is likely to remain a topic for the future in spare parts supply – with realistic potential, but still on the way to widespread implementation.
