PockedRecording Car

MMD 84.09

Towed MMD bogie behind road/railway vehicle

MMD84.09 is a semi-autonomous contact track geometry measuring system. It consists of the towed bogie, wireless data transition, rugged measuring laptop, semi-real time measuring software and comfortable advanced analysis software. The measuring speed is limited only by maximum traveling speed on certain track quality. The speed can be more then 25km/h for good CWR track. The permanent lateral contact of the bogie wheels and running edge of rails is provided by pneumatic cylinders powered by pressure air from towing railway/hirail vehicle.

The main features are :

  • Rugged, reliable and low-cost “pocked track recording car”
  • Wireless data transition
  • Comfort visualization of the measured data, entry of the track Events
  • Precise synchronization of the track Events and geometry
  • Precise localization along the track
  • All advanced data analysis features as usual on big systems are available
  • The database of the track facilities is incorporated into the measuring and analysis software in user-friendly way. The track database supports the Design values of the Cant, curve radius and Gauge, the speed zones and many others.


  • Mechanical structure of the bogie, towing bar
  • Pneumatic system (air tank, cylinders, controllers and valves, air pressure sensors 2pcs)
  • Electronic system
  • potentiometers 5pcs, optical encoder 1pc, inclinometer 1pc, rate-gyro 1pc, indicators of the bogie derailment 3pc
  • Data acquisition electronic board DMN, input of the GPS receiver
  • Generator of synchronization pulses (it provides an exact synchronization of geometrical values and track events)
  • Ethernet board, providing a wireless data transition from the bogie to the measuring computer (Panasonic toughbook), being placed in the cabin of the towing vehicle.
  • Low cost GPS receiver
  • Battery 2x6V 12Ah (it provides 8h of operation without charging)
  • Pulse Battery Charger. The charging is available also during measuring in emergency case

Measuring software Krab9vNET

  • Graphs of measured geometric values (Gauge, Align_L/R, Track curvature, Top_L/R, Cant, Cant_dyn, Twist_any bases, KM)
  • and technologic values (force/pressure of the air)
  • Graphical presentation of the track design values from the track database
  • Input of the track events and KM discontinuities from keyboard, the events are precisely synchronized with the track geometry thanks the pulse generator
  • on-line evaluation of the Gauge, Cant and Twist
  • indicating of the battery level
  • safety storage of the measured data to KRX data form

Evaluation software Krab8.1

  • Fast and comfort evaluation of the stored geometry data
  • The results printout in form
  • graphs of geometry values
  • tables of local defects
  • tables of a section evaluation
  • overview maps of the measured track

Rugged measuring notebook Panasonic TOUGHBOOK CF-19

Technical data:

  • Max. measuring speed 25km/h (it is limited only by risk of derailment, measuring system can work till 40km/h)
  • Precision of some geometry values:
  • The others presented geometry values (derived):
  • Measuring speed
  • lateral forces on wheels
  • Twist on selectable bases
  • Track curvature
  • Cyclic joint
  • Gauge100
  • Unbalanced lateral acceleration
  • The request for of the air-pressure source 8bar