Track Geometry Measuring Devices

Track Geometry Measuring Devices

KZV focuses its activity on development and production of complete track geometry measuring devices, and rail and wheel profilemeters, clearance scanners. KZV also provides on-demand track geometry measurement, evaluation and consultancy.

Complete track geometry measurement systems

The KRAB™ complete track geometry measurement system was designed as a unique, stand-alone measuring system. The KRAB is a trolley that can be pushed / pulled by a human operator or coupled to a two-way vehicle. Its modular concept adapts to all available track gauges from 545mm to 1,668mm.

KRAB can be equipped either with rollers or flanges, and flanges can be adapted for convenient tramway rail measurement. The main geometrical quantities KRAB measures are gauge, vertical and horizontal alignment (top), cant, and twist. Optionally, it can be equipped with a GPS module for easier localization of defects, track-gradient measurement, etc.

Sophisticated evaluation software recalculates measured data to real geometry, and displays measurement history, events, local defects and quality indices.

The KRAB system is available in two versions - KRAB 84.09 and KRAB S-Light.

The original KRAB called KRAB 84.09 has a robust, steel construction and weighs about 65kg. The measurement speed is limited to approx. 15kph. KRAB84.09 can be used for switch point inspection as an option. The extra auxiliary rollers for flange groove width measuring have to be mounted on the basic trolley

The KRAB Slight system is the latest step of Krab evolution. It was designed with focus on low weight and easy operation. The measurement speed is limited to approx. 15kph. The trolley weights app. 30kg, only one operator is capable to take it away from the track. On-board computer has enough memory for at least 2000km; its battery works 8 hours without charging. The trolley has versatile adjustable nominal gauge in wide range as an option (for example 760-1676mm).

The MMD vehicle is designed for rail geometry measuring of the track at approximately 40km/h. This measuring system is mechanical (contact) with utilization of some inertial principles.

The MMD frame has been developed as a fully independent unit and can be mounted under any suitable rail vehicle. Measured data is evaluated using software that displays measurement history, events, local defects and quality indices.

Clearance scanner

KSLT Tunnel scanner is a railway clearence scanner. It can be used for scanning of tunnels, railway platforms, vegetation or any objects located along the track. As the system is based on stable Krab platform, it also measures full track geometry data. In such way the system gets enough data to reconstruct full 3D profile of the tunnel tube.

The system is further equipped with IR camera, which is fully synchronized with the profile measurement and provides valable visual data. The IR camera is supported by IR headlight operating in a flash mode with power of 400W.

The trolley is intented to be pushed manually with typical walking speed of 4 kph. The typical sample size on tunnel wall with this speed is 2 x 2 cm. After the measurement is finished, the data is copied to USB flash disk and furhter processed by evaluation program on PC.

Frog profilemeter

Contour is a laser device for the measurement of cross sections of tramway and flange rails, and cross-sections of frogs including their grooves. Contour operates on the principle of flat sampling of the entire laser light-path on the surface of the measured rail.

The entire cross-section highlighted by the laser is sampled at one moment. To generate the laser path, a red laser with a cylindrical lens is used. To sample the laser mark image on the rail surface, an area image sensor with integrated control computer is used.

Roughness and corrugation

MDK02 is a measuring device intended for the measurement of rail surface roughness for the needs of railway track noise assessment, and for the measurement of corrugation. It is able to independently measure uninterrupted segments in a length of several metres, evaluate the acquired data and compute the resulting third-octave band analysis in conformity with the standard EN15610-41. Sensors can be easily adjusted into the centre of smooth rut run by vehicles on the rail head. For the measurement,
MDK02 uses two independent versines with contact sensors placed perpendicular to longitudinal axis of the rail.

Wheel diameter caliper

SPIDER is an electronic device designed to measure versine values and to make subsequent calculations of wheel diameters of railway and tram vehicles.

Practical applications of the SPIDER are as follows:

  • Wheel checking for operational wear (wheel diameter)
  • Wheel testing before re-profiling

Contact Details

Komercni Zeleznicni Vyzkum, sro
U Kaplicky 1199
Praha 6
Czech Republic
Contact: Josef Turek (Dipl Ing CSc)
+420 233 920 185

Available White Papers


CRAB Recording Trolley for Track Geometry 22 May 2012 The CRAB system has been designed to complete larger and more sophisticated measuring cars, and it is ideally used on secondary routes, sidings, switch points and for new track acceptance. The measurement speed is limited to approximately 15km/ph.