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Contact 4.0 is a software suite that implements the EN15302 standard recommendations.

The equivalent conicity is a fundamental parameter used to define the quality of wheel-rail contact, and therefore the dynamic running performance of the rolling stock.

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Equivalent conicity

The equivalent conicity can be calculated for each wheel-rail interface, in function of the lateral displacement of the hunting motion.

The contact geometry is a set of functions:

  • Difference of rolling radius right and left

  • Tangents of contact angles

  • Coordinates of right contact points

  • Coordinates of left contact points

  • Equivalent Conicity

  • Steering index

contact main
contact conicita linea

Data integration

The software can calculate all parameters of contact geometry for wheel-rail and wheelset-track coupling, knowing the profiles of the wheel and of the rail.
Contact 4.0 is interfaced with all DMA instruments for wheel and rail profile measurement, both manual and optical without Contact 4.0. It is possible to use data coming from third-party sources.
The most important commercial file structure formats are included in a file import module, but it is possible to develop customized import modules.


The potential of having a large amount of data measured with the DMA instruments, allows for many calculation options.

The wheel-rail calculation possibilities are:

  • Single wheel-rail contact calculation

  • All possible combinations between a number M of wheelset profiles and a number N of tracks profiles (MxN single calculations)

  • Continuous diagram of equivalent conicity obtained by multiple calculations between a wheelset and all the sections measured on track section

contact line proc

Example of Contact 4.0 output

contact contatto singolo

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