Rail ID and DPM Marking: Traceability of Railway Parts

A bogie passes through several maintenance shops before being retired. An axle may sometimes change operators without ever losing its identity. In the rail industry, every rolling stock component must remain identifiable throughout its entire service life, despite heat, grease, vibrations, and repeated industrial washings. A conventional adhesive label will not hold up in such an environment. To address this challenge, the GS1 ID Rail standard governs the identification of railway components. Direct-part marking (DPM) has emerged as the standard method for conveying this identity. Engraving a Data Matrix code directly into the metal gives each part an identity that lasts as long as the part itself. CIPAM supports manufacturers, operators, and rail maintenance shops in implementing this traceability system, from laser engraving through to integration with maintenance management tools.

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The Challenge of Railway Traceability: Safety, Maintenance, and Counterfeit Parts

A misidentified rail part is one that cannot be properly inspected. Whether it’s an axle, a bogie, a brake, or a safety component, the inability to trace a part’s exact origin compromises the entire maintenance chain. Without a reliable and durable identifier, it becomes difficult to know which batch a part comes from, when it was manufactured, or what inspection procedures it has already undergone.

Railway maintenance relies on long cycles, with scheduled maintenance performed at specific intervals and parts moving between multiple sites. Fragmented traceability forces technicians to reconstruct a part’s history using paper documents or disjointed databases, with a risk of error at every step. In contrast, a unique identifier affixed directly to the part allows its complete history to be viewed instantly.

The issue of counterfeit or non-compliant parts adds another layer of complexity. A part circulating without reliable markings or with a label that can be easily replicated opens the door to substitutions that are difficult to detect. Direct marking on the part specifically addresses this risk, as it etches the identification into the material itself, without a removable label that could be peeled off, erased, or duplicated on a different original part.

The GS1 ID Rail Standard: A Common Language for Identifying Components

The GS1 ID Rail standard was developed to provide the rail industry with a shared identification framework for all stakeholders in the supply chain: component manufacturers, rolling stock integrators, operators, and maintenance providers. It is based on GS1 principles already established in industry and logistics, adapted to the specific characteristics of rolling stock and its very long life cycle.

Specifically, ID Rail specifies how to structure the identifier of a rail component so that it remains readable and interpretable by all relevant information systems, regardless of the operator or maintenance facility handling the part. This standardized structure prevents duplicate entries and proprietary identifiers that cannot be transferred from one system to another. It also facilitates exchanges when there is a change in operator or a transfer of a part between two maintenance shops that do not use the same tools.

Adopting this standard means choosing a identification system designed to remain legible throughout the entire service life of a railway part—which can sometimes span several decades. It also prepares the company for smoother data exchanges with its partners, subcontractors, and regulatory authorities.

CIPAM Expert Commentary: “With ID Rail, the challenge isn’t just to mark a part—it’s to give it an identity that can be understood and utilized by the various stakeholders involved in manufacturing, maintaining, or using it. By relying on GS1 standards, we create a common language that allows information to track the part, even when it changes hands or moves to a new stage in its lifecycle.”

Direct Part Marking (DPM) via laser engraving: the key concept for piece-by-piece traceability

The ID Rail standard defines the structure of the identifier. Direct Part Marking (DPM) defines how the identifier is physically applied to the component. This combination forms the core of a robust railway traceability system: a standardized identifier, engraved directly into the material, that remains readable from the time of manufacture until the end of the part’s life.

Engrave the Data Matrix directly onto the part

Direct marking involves laser-engraving a Data Matrix code directly onto the surface of the component itself, whether it is made of steel, cast iron, aluminum, or any other material used in rolling stock. Unlike a label, this code is an integral part of the part. There is no adhesive, no backing to peel off, and no protective film. Industrial laser marking allows you to select the engraving depth and contrast best suited to the material and the part’s intended use.

Ensure that the markings remain legible over time

Railway components operate in a demanding environment: mechanical friction, exposure to greases and lubricants, high-pressure washing cycles, and significant temperature fluctuations. Engraved markings must remain legible despite these stresses, often for years. The choice of engraving parameters, line depth, and the contrast quality of the Data Matrix code are critical to ensuring this long-term legibility, even when the part’s surface oxidizes or becomes slightly soiled over time.

Reading the code in the workshop, even under difficult conditions

An engraved code is useless if it cannot be read quickly in the workshop, on a part that may be dirty, oily, or partially obscured by wear. Data Matrix code reading and verification systems make it possible to check the quality of the engraving during manufacturing and then reliably read the code during every maintenance procedure, without relying on perfect lighting or a perfect reading angle.

Link the marking to the CMMS and the maintenance history

The engraved code is only valuable if it provides access to useful information. Once read, it must allow the user to instantly retrieve the complete part record in the computer-aided maintenance management software: date of manufacture, inspection history, past repairs, and related parts. This link between physical markings and the information system is precisely what interests the ECM—the entity in charge of maintenance—in its tracking of rolling stock components.

The Benefits of Traceability in Compliance with DPM Marking and the ID Rail Standard

Adopting direct marking and the ID Rail standard transforms the way a rail component is tracked throughout its lifecycle. The identifier becomes permanent: it no longer depends on a label that can come off or on manual markings that can fade. Each component retains its identity from the time it leaves the factory until it is scrapped.

“With ID Rail, the goal isn’t just to mark a part—it’s to give it an identity that can be understood and utilized by the various stakeholders involved in manufacturing, maintaining, or using it. By relying on GS1 standards, we create a common language that allows information to follow the part, even as it moves between different parties or stages in its lifecycle.” Vincent — GS1 Expert at CIPAM

This system greatly simplifies the work of maintenance teams. A technician can identify a part in a matter of seconds, without having to manually search through paper records or re-enter a hard-to-read serial number. The history is automatically retrieved, which reduces the risk of service errors and ensures informed decisions regarding whether to keep the part in service or retire it.

Compliance with the GS1 ID Rail standard also facilitates exchanges with external partners. A subcontractor, a new operator, or a regulatory authority can interpret the identifier without needing to be familiar with a proprietary system. This interoperability becomes an asset whenever a fleet of rolling stock changes hands or a component moves between multiple repair shops.

Finally, reliable direct marking builds confidence in the origin of parts. It becomes more difficult to introduce an untraceable or non-compliant component into a maintenance process that systematically verifies the engraved marking during each service call.

Our approach to implementing DPM marking and ID Rail traceability

CIPAM implements this type of project using a method that has been proven effective by manufacturers and railway industry stakeholders. Each step is designed to ensure the reliability of the marking before extending it to an entire range of parts.

Audit of the parts inventory and material constraints. We analyze the materials, shapes, and potential marking areas on your railway components, as well as the operational constraints to which they are subjected.

Selection of laser technology and parameter settings. Depending on the material and the desired service life, we select the engraving technology and parameters that ensure the Data Matrix remains legible over time.

Verification of readability and compliance. Each marking is inspected after engraving to ensure that it complies with the ID Rail standard and is readable by the scanners used in the workshop.

Integration with the CMMS. We integrate Data Matrix code scanning with your maintenance management system so that each scan opens the relevant part’s record directly.

Team Building. Workshop technicians and quality managers are trained in reading, verifying, and using DPM markings on a daily basis.

Frequently Asked Questions About ID Rail and DPM Marking

What is the GS1 ID Rail standard?

GS1 ID Rail is a standard that defines a standardized identification structure for railway components. It enables all stakeholders in the supply chain—from manufacturers to maintenance shops—to use a common language to identify a rolling stock component.

What is direct part marking (DPM)?

Direct part marking (DPM) involves engraving a Data Matrix code directly onto the surface of a component using a laser, without using an attached label. The code is an integral part of the component.

Why not use a standard barcode label on a railroad part?

A conventional barcode label can peel off, wear out, or deteriorate when exposed to heat, grease, and the repeated industrial cleaning that railway parts undergo. Direct marking via laser engraving withstands these conditions because it is integrated into the material itself.

What role does ECM play in the traceability of railway parts?

The ECM (Entity in Charge of Maintenance) is the entity responsible for overseeing the maintenance of rolling stock. Reliable traceability, enabled by direct marking in accordance with the ID Rail standard, allows the ECM to access the complete history of each part and to justify maintenance decisions.

What laser technology does CIPAM use for this type of marking?

The choice of laser technology depends on the material of the part and the level of durability required for the marking. CIPAM selects and configures the most suitable solution after analyzing your parts and their operating conditions.

How do you link DPM labeling to CMMS software?

Once the Data Matrix code is scanned by a shop floor scanner, the identifier is transmitted to the computer-aided maintenance management software, which automatically opens the record for the relevant part. CIPAM configures this integration to work with your existing system.

Is DPM marking suitable for parts already in service?

Yes, direct marking can be applied to parts already in service during a maintenance operation, provided that a suitable engraving location is chosen that preserves the mechanical integrity of the component.

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