Hergie® track Measurement system


Hergie® track Measurement system

aDjustMEnt pROcEss in 2 stEps

Rough adjustment:

With the help of a mechanical lift-adjustment device,

the position and height of the track are aligned to a

precision of +/- 2 mm.

fine adjustment:

The track is moved manually into the final position and

then fixed. Each individual position is then documented

by the software. Subsequently, evidence of the accuracy

of the adjusted track is always available.

HERGiE ® tRack suRvEyinG tROllEy

The track surveying trolley constitutes

• An inclination sensor

• A length sensor for the gauge

• A reflector

• An optional rail inclination sensor

Thanks to its light weight, it can be easily transported by

one person.

RtE technologie GmbH

Dipl.-ing. Dr. Helge Grafinger

teisenberggasse 25

5020 salzburg/austria

tel. +43 662 421066



RtE tEcHnOlOGiE GMBH, salzBuRG

Since August 2009 RTE’s developments have expanded the competence profile of the Rhomberg Rail Group in the area of

railway track systems and measuring technology.

The team consists of a wide range of expertise, which includes construction engineers, surveyors, electronic engineers and

software engineers. They develop and optimise complex systems for a variety of specialised disciplines.

The core competences of RTE Technologie GmbH is railway track systems (slab track construction and equipment and the

rehabilitation of tracks and tunnels) as well as the development of surveying systems (track surveying and geomonitoring

systems). All these developments are characterised by their practical application. They have been tested and applied to

in-house projects for the Rhomberg Rail Group.

RTE Technologie GmbH also develops solutions in other technical areas (mechanical construction, software

programming, geometry tasks, digital image processing, and microprocessor control systems) to outside companies.

Our office in Salzburg is fully equipped with a test railway track and the necessary infrastructure to support CAD, software

and electronic developments.



tRack MEasuREMEnt





pREcisiOn witH a systEM: HERGiE ®

Modern railway technology constantly faces new

challenges: trains are becoming more powerful, faster

and the intervals between them, ever shorter. The demands

on the infrastructure are rising in parallel.

The innovative Hergie ® track surveying system was

developed as part of the high-speed Cologne-Frankfurt

(Germany) rail project by Rhomberg Rail in cooperation

with the Bahnbau Wels subsidiary. Since then its high

quality has substantiated itself in a variety of other


This online measuring system for the adjustment and

documentation of track condition, compromises of

tachymeter-controlled track surveying trolley, which

optimally measures track position, cant, gauge and rail


The measured data are compared “online” with the

pre-specified values for height, position and alignment.

Deviations to these values are shown in real-time on the

user’s monitor.

This means that they can be immediately and accurately

detected to be rectified on the spot.

HERGiE ® sOftwaRE

The “heart” of the Hergie ® track measurement system is

the software developed by RTE. It is available in

English and Spanish.

The system is based on a highly accurate, three-

dimensional single position.

At each measuring point, a total of five values are

measured: the coordinates in three dimensions, cant and


All further required parameters can be derived from

these values. Moreover, it is also possible to monitor the

entire inner track geometry.

As the precision of the derived parameters depends

directly on the accuracy of the measured data, only the

best quality sensors are used.

The basic prerequirements in describing track geometry

using coordinates are:

• An accurate and stable reference-point network

• Accurate measurements of coordinates at

individual points

Longwave errors (wavelengths that are greater than the

distances between the positions of the instruments) are

directly proportional to quality of the reference-point


In order to avoid the impact of longwaves, we

recommend that the reference-point network be

measured with a highly accurate, tachymeter-controlled

method. Mobile pillars containing a centring device is

recommended. They are also used to position the

tachymeter while the tracks are being aligned.

The reference-point network can also be used to verify

the track alignment.

Individual track alignment points are measured using a

precision tachymeter (direction angle ≥ 0.3 mgon). The

relative accuracy between two reference points at a distance

of approx. 60 m is subsequently below 0.5 mm.

Picture: The geometric height and direction relations are

shown at a single position of the track surveying trolley.

An inclination towards the centre of the track (longitudinal

inclination) is not taken into consideration. For a

standard track width (1.435 mm) the inclination in the

graphic is based on 1.500 mm (distance between the

two rail centres).

The displayed parameters are shown for each individual

position of the track surveying trolley.

The Hergie ® surveying system requires the following:

• a positioned and orientated total station in the

coordinate system of the reference-point network

• Geometry specified according to axis, gradients and


In order to continuously provide the most accurate

results, all sensors, including the tachymeter have to be

regularly calibrated. The software is compatible and supports

regular calibration.

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