Testing Railway Vehicles to Improve Vehicle/Track Interaction (continued) For on-track tests employing the normal measuring method, the following direct measurement are all necessary: guiding force Y and wheel force Q, accelerations at the bogie in the case of bogie vehicles, and accelerations and in the vehicle body. For on-track tests employing the simplified measuring method, the measurement of lateral axle box forces (H) must be determined using accelerations at axle boxes in the case of non-bogie vehicles, accelerations at the bogie in the case of bogie vehicles, and accelerations or in the vehicle body. Wheel/rail contact and axle-box forces must be measured on at least the two outer axles of the vehicle or one bogie, depending on whether the vehicle is fitted with axles or bogies.
Measuring points for accelerations in the vehicle body are situated on the vehicle floor. The reference point for coaches and wagons is above the bogie center; for traction units it is the driver's cab. On multiple units and passenger coaches, accelerations must additionally be measured at the center of the vehicle body. Measuring points for accelerations at bogie frames are at one bogie frame above the two outer wheelsets. In the case of vehicles with special bogies, multiple transport units or multiple units, the scope of measurement must be adapted to the requirements.
In addition to the measured parameters, speed V,andcant deficiency cd must also be measured. Table 2 shows the specific operational parameters recommended for application during the testing of running behavior for international traffic (see Table 2 - click here.)
Table 3 contains a summary of the symbols of the quantities and characteristic figures for testing of the running behavior and stationary tests as well as supplementary information and terms (see Table 3 - click here.)
Robert Masar Dipl. Ing. is System Specialist, Railway Research and Development Institute (Slovakia)
OCTOBER 2005 "Operating at High Cant Deficiency" READ ARTICLE
JULY 2004 "Improving Truck Designs to Reduce Forces Transmitted to Track" READ ARTICLE
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in the case of bogie vehicles, and accelerations 
in the vehicle body. For on-track tests employing the simplified measuring method, the measurement of lateral axle box forces (H) must be determined using accelerations at axle boxes 
in the case of non-bogie vehicles, accelerations at the bogie 
