Download the specification summary sheet here. 

The features and specifications of equipment given on the below are illustrative only. They are not a guarantee of performance in a particular case. For more information, please contact us.





Weight & Portability

Portable, 9kg instrument, 18kg in case. Operated by one person

Vehicle or hi-rail mounted or self-contained bogie

Vehicle mounted

Measuring speed

Walking speed: 2-5km/h

3-15km/h typical.  Versions available for 0.5-50km/h.

Typically 30-140km/h.  Lower speed possible with reduced accuracy, particularly at long wavelengths

Measuring principle

Contacting transducer

Contacting transducer

Axlebox accelerometers

Measurement type

Single rail

Both rails simultaneously

Both rails simultaneously

Requirements regarding train or vehicle

None: portable system

Minimal wheel irregularities; pneumatic or hydraulic actuation; mains power
(110-250V AC)

Minimal wheel irregularities; electronic tachometer; good primary suspension; minimal friction elements; mains power (110-250V AC)

Typical accuracy

Better than 0.001mm RMS in 30-100mm wavelength range

Better than 0.001mm RMS (0.5-15km/h) or 0.003mm RMS (15-50km/h) in 30-100mm wavelength range

Better than 10dB,

Computing requirements

1GHz Pentium or better

2GHz Pentium or better

1GHz Pentium or better


Proprietary, Windows based

Proprietary, Windows based

Proprietary, Windows based

Data collection, signal processing & display [1]

- Profile of one rail at 1mm or 2mm interval and 0.01 micron resolution

- Filtered profiles[2]

- RMS amplitudes in “block” or moving window[2]

- Peak-to-peak amplitudes in block or moving window[2]

- Percentage exceedence[4]

- One-third octave band spectra

- Profile of both rails at 2mm interval and 1 micron resolution

- Filtered profiles[2]

- RMS amplitudes in “block” or moving window[2]

- Peak-to-peak amplitudes in block or moving window[2]

- Percentage exceedence[4]

- RMS amplitudes in “block”[3]

- Percentage exceedence[4,5]


- One-third octave band spectra

Automatic detection discrete irregularities (e.g. welds)

Available in “non standard” software

Available in “non standard” software

Yes, ranked into up to 7 ranges of severity

Annotation of records with features of line (bridges, etc.)




Typical uses

- Corrugation surveys and troubleshooting

- Quality Assurance for grinding

- Accurate measurement of short lengths of track (2- 5km/h)

- Measurements for acoustics work

- Verification and calibration of other equipment, e.g. RCA and HSRCA

- Corrugation surveys

-  Production of reprofiling programmes

- Quality assurance of reprofling

- Accurate measurement of moderate lengths of track

- measurement of long  wave irregularities, which influence ground-borne vibration and noise

- Measurement of complete rail systems to assess grinding requirements

- noise surveys and “mapping”

- assessment of locations in track giving high dynamic loads (for damage to vehicle components and track)

-  assessment of locations compliant with requirements of EN15610:2009, ISO EN 3095 etc


[1]   All software can export ASCII files of calculated data e.g. for post-processing with other software.

[2]   For wavelength ranges 10-30mm, 30-100mm, 100-300mm, 300-1000mm, 1000-3000mm,
30-300mm, 300-3000mm and 150-1500mm.

[3]   For up to 7 non-overlapping, user-specified wavelength ranges

[4]   The “percentage exceedence” is the percentage of the measured length over which a measurement of the profile exceeds a specified limit. The measurement can in principle be of any quantity e.g. raw or filtered profile, RMS or peak-to-peak average displacement in a moving window.

For the HSRCA, percentage exceedences can be calculated for up to seven specified amplitude limits.