Maintenance in the railway sector: An overview of the four ECM functions
17. September 2026
The experts at our W.S. RailwayCenter support ECM II and ECM IV with tasks including the planning, execution and evaluation of tests, as well as the preparation of testing documents and testing instructions.
Rail transport has long been an important part of our infrastructure, enabling the efficient movement of people and goods over long distances. Behind this complex network lies a multi-layered system of safety, reliability and operational efficiency. This system requires careful maintenance to ensure smooth operation.
A central part of this system is the Entity in Charge of Maintenance (ECM). Understanding its role and importance is fundamental to understanding how railway operations maintain safety standards and meet regulatory requirements.
Regulatory significance
Railway systems operate within strict legal frameworks designed to protect public safety and ensure interoperability at both national and international levels. These laws define who may or should take responsibility for maintenance tasks and outline procedures for certification, supervision and accountability. Implementing Regulation (EU) 2019/779 governs the concept of the Entity in Charge of Maintenance, the entity responsible for maintaining a railway vehicle.
In many countries, including Germany, the designation of an ECM is based on national railway law, supplemented by European regulations such as the Technical Specifications for Interoperability (TSI). These requirements set out technical standards that vehicles must meet to be recognised as safe for cross-border operation or operation within particular networks.
But what does ECM mean in day-to-day work? And who actually does what?
ECM: Four functions, one maintenance responsibility
The regulation aims to establish a consistently high level of safety in the maintenance of rail vehicles. This also significantly increases the requirements for expertise, documentation, quality assurance and risk management. It distinguishes four ECM functions:
- ECM I – Maintenance management
- ECM II – Maintenance development
- ECM III – Fleet maintenance management
- ECM IV – Maintenance delivery
The four functions cover different areas of maintenance responsibility. In practice, these tasks do not necessarily have to be performed by four separate organisations. What matters is that tasks, responsibilities and interfaces are clearly defined and effectively implemented.
ECM I: Maintenance management
The maintenance management function (ECM I) has overall responsibility for the maintenance management system. It ensures that the necessary structures and processes are in place and function effectively. This includes commissioning the other ECM functions and monitoring their implementation.
ECM I therefore establishes the organisational framework for maintenance. It ensures that responsibilities are defined, processes work together and safety and maintenance requirements are implemented systematically.
ECM II: Maintenance development
The maintenance development function (ECM II) defines the relevant requirements. It determines what must be tested or maintained on a vehicle or component, when and how this must be done, and what result must be achieved. This involves answering questions such as:
- Which regulations apply?
- At what intervals must testing be performed?
- Which individual maintenance programme is required for the vehicle’s specific operating conditions (mountain routes, high speeds, tight curves, heavy loads)?
ECM II is also responsible for monitoring the vehicles and using the findings to continuously develop maintenance requirements. Findings from tests, damage or ongoing operation indicate whether existing maintenance requirements remain appropriate or need to be adapted.
ECM II thus links regulations, technical requirements and operating experience, providing the foundation for continuous improvement in maintenance.
ECM III: Fleet maintenance management
The fleet maintenance management function (ECM III) is responsible for organising maintenance of the vehicles in the fleet. This function:
- selects and commissions an appropriate workshop,
- issues a clear maintenance order, including the applicable regulations,
- receives feedback once maintenance has been completed,
- returns the vehicle to operation.
ECM III therefore acts as the operational interface between fleet operation and workshop capacity. The workshop needs more than notification that a vehicle requires maintenance: it also needs a clear order and the relevant requirements.
ECM IV: Maintenance delivery
The maintenance delivery function (ECM IV) is the entity that performs the work – usually a workshop where the tasks are actually carried out. It is responsible for:
- performing maintenance in accordance with the order,
- fully documenting and archiving the work carried out,
- reporting completed and uncompleted work back to ECM III.
ECM IV therefore provides more than evidence of the work carried out. Its findings also provide important information for the future management and development of maintenance. In practice, not everything goes to plan: if work is not performed, or is only partially completed, this information must also be reported back in a traceable manner.
Interfaces determine effectiveness
ECM I has overall responsibility, ECM II defines the necessary measures, including testing, ECM III organises their implementation, and ECM IV carries out the work and documents the results (or commissions a service provider). The knowledge gained is fed back into the maintenance system.
These interfaces are crucial. A weakness in one function – such as unclear requirements from ECM II or incomplete feedback from ECM IV – directly affects the safety and availability of the entire fleet.
Conclusion: ECM is more than an obligation
An effective ECM system establishes clear responsibilities, structured processes and traceable decisions. At the same time, it ensures that maintenance findings are not lost but are fed back into the system.
Even the best maintenance requirement is of little use if it is not clearly communicated to the workshop. Conversely, workshop findings provide valuable information for improving maintenance. Companies should therefore address ECM before an inspection or certification is due. Considering responsibilities, interfaces, technical requirements and documentation processes early creates the foundation for effective, reliable maintenance.
How we support ECM II and ECM IV
We support ECM II and ECM IV in their respective tasks. The experts at our W.S. RailwayCenter combine qualified testing personnel with an understanding of materials engineering and sector-specific experience. This means we do not assess testing tasks in isolation, but always in the context of the component, inspection method, regulatory framework and specific application.
For ECM II, this means supporting the planning, execution and evaluation of tests, as well as the preparation of testing documents and testing instructions. We contribute our knowledge of the state of the art, suitable inspection methods and relevant standards and regulations. We also help to interpret the findings from a technical perspective and make them useful for maintenance.
For ECM IV, we provide targeted support through testing services, testing systems and NDT certification of workshops and processes.
As an NDT competence centre for railway maintenance in accordance with DIN 27201-7(opens in new tab) we support maintenance workshops in obtaining recognition for non-destructive inspection methods and validating non-destructive testing systems. Our Level 2 and Level 3 examiners, certified in accordance with DIN EN ISO 9712, ensure proper testing and evaluation under the applicable standards and regulations.
The experts at our testing laboratory, accredited to ISO/IEC 17025,(opens in new tab) also support ECM IV with their extensive experience in materials testing and the non-destructive testing of railway components.
We also offer two testing systems that workshops can use to test railway components. The Wheel Set Scanning System (WS3)(opens in new tab) is a new testing concept for ultrasonic testing of wheelsets. With ResiduStress, we have developed an ultrasonic measurement method(opens in new tab) for non-destructive residual stress measurement.
In addition, we train and qualify workshop testing personnel(opens in new tab) in all common destructive and non-destructive inspection methods.
Our ECM II customer event
Our customer event also focuses on safe and efficient maintenance in the railway sector. Under the title “ECM II in focus: Insights from practice”, we invite you to the Zollverein site in Essen on 13 and 14 October 2026.
Together, we will explore how regulatory requirements can be reconciled with the challenges of day-to-day operation. We will also show which inspection methods create genuine added value for maintenance.
Look forward to two days of:
- in-depth expertise,
- practical insights,
- the latest ideas from the industry,
- personal exchange with industry representatives,
- discussions with the experts at our W.S. RailwayCenter.
Participation is free of charge, but places are limited.
