In rail maintenance, availability, safety, and compliance are key. As a NDT competence center, we support operators, ECM, and maintenance workshops with standard-compliant inspections according to DIN 27201‑7 – from planning (inspection plans, test instructions) to documented release. Our inspection personnel are qualified according to DIN EN ISO 9712 (industry sector rail).

Scope of Services & Assemblies

Axle shafts – with longitudinal bore (hollow shafts) and without longitudinal bore (solid shafts)
Wheels / wheel discs & tires
Bogie frames and vehicle frames (weld seams)
Draw hooks, tension rods, central buffer couplings
Buffers & buffer assemblies as well as other components

Overview of NDT Methods

Ultrasonic Testing (UT) – volumetric flaw detection
Magnetic Particle Testing (MT) – surface/near-surface cracks
Penetrant Testing (PT) – non-magnetic components, weld seams
Visual Testing (VT) – visual assessment & documentation
Radiographic Testing (RT) – radiographic evaluation

Your Benefits

Legally compliant inspections according to DIN 27201‑7
Consistent documentation – digital inspection reports
Interface-capable – inspection plans, test instructions, evaluation
Experience in the rail sector – axle shaft, bogie, frame

Frequently Asked Questions

What is Zeros GmbH?

Zeros GmbH is an independent testing laboratory for destructive and non-destructive materials testing. We support companies from incoming inspection to series release – including digital test reports and full traceability.

We operate under accreditation to DIN EN ISO/IEC 17025 (quality management for laboratories). See our current accreditation information here.

Write an email Accreditation Certificates

Which standards is Zeros GmbH accredited to?

We are accredited by DAkkS to DIN EN ISO/IEC 17025. This standard ensures that test methods, equipment control, personnel qualification and reporting meet the highest requirements.

An overview of services and scopes is available on our homepage.

Write an email Accreditation Certificates

What services does Zeros GmbH offer?

Our portfolio covers NDT (UT, RT, MT, PT, VT), mechanical testing (tensile, hardness, Charpy), metallography (microstructure, grain size, coating thickness) and chemical analysis (e.g. OES, XRF). We also provide specimen preparation, documentation and consulting.

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How can I use Zeros GmbH's services?

Please contact us by email or use the contact option on the website. Share material, standard/specification and quantity – we'll get back to you promptly with a solution.

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Approval for Rail

Inspection Certificate

The inspection body of DB Systemtechnik confirms with the inspection certificate the conformity of our NDT testing facility with the requirements of DIN 27201‑7 for the industry sector railway maintenance. Basis is the inspection from 17.02.2022 and the inspection report 68039‑003‑IGZfP‑IB‑9010 dated 07.06.2022 (registration number DB‑52‑AB‑319‑1‑22).

Approved NDT Methods (Excerpt)

Component	NDT Method
Axle shaft with longitudinal bore	UT · MT · VT
Axle shaft without longitudinal bore	UT · MT · VT
Wheel / wheel disc	UT · MT · VT
Bogie frame	UT · MT · VT · PT
Vehicle frame	UT · MT · VT · PT · RT
Draw hooks, tension rods, parts of central buffer couplings	UT · MT · VT · RT
Buffers, buffer assemblies	UT · MT · VT
Other components	UT · MT · VT · PT · RT

Note: The certificate refers to the objects and conditions specified in the inspection report. Entry in the DGZfP register: valid from 01.03.2022 to 28.02.2027.

Rail Maintenance

Inspections on Running Gear Components – NDT for Rail Companies

Ultrasonic Testing (UT)

Magnetic Particle Testing

Visual Testing

Penetrant Testing (PT)