The technical specifications require not one, but two vibration tests on the railroad track prior to acceptance: compliance with the rail roughness profile and the track’s ability to dampen vibrations. Here’s what you need to deliver, and why the timeline, not the measurement, is what poses the risk.
This is not redundant. The two controls target two different links in the same chain — the one that ends with the resident. Controlling just one link is not enough: the specification requires verifying both the source AND the filter.
What’s Included – What to Expect
Goal: Verify that the rail surface meets a specified roughness standard, which ensures controlled vibration as trains pass over it. Measure both rails.
Conformity : EN 15610 & EN ISO 3095 standards.
The point that’s often overlooked — Inspection makes sense when combined with grinding: as long as the grinder is available, any out-of-tolerance area can be corrected immediately. Once the grinder is taken offline, any nonconformity means it must be brought back online, causing a delay.
Goal: Verify during the construction phase (when trains are not running), that the installation effectively dampens vibrations by utilizing the resonance frequency of the ties and the stiffness of the tie pads.
Compliance criterion as agreed upon with the project owner: resonance frequency under load, or insertion loss/attenuation level.
The critical point to anticipate — The criteria and methodology must be approved by the project owner prior to the first data collection campaign (as outlined in a methodological report prepared in advance). Without this approval, there is a risk of collecting data “in a vacuum” and having the results challenged upon acceptance.
The roughness of the running surface causes friction between the wheel and the rail. This is the source of the vibrations.
The stiffness of the sole plates beneath the cross-ties determines the energy transmitted to the ground and, subsequently, to buildings.
What is perceived: discomfort, structure-borne noise, disruption of sensitive activities (hospitals, auditoriums, etc.).
The process is well-established. What throws off a project completion schedule is the sequence of deadlines.
An inspection initiated too late means a team is unavailable, a grinder has already left, or a non-conformity cannot be rectified. Each time, this results in a delay in track acceptance.
The inspection becomes a tool for managing the grinding process, not just an administrative formality.
Seven points are all it takes to secure a campaign—and your reception.
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The source and the filter: 40 years of expertise