The Baseline 3 Release 2 has brought substantial improvements to the ERTMS specifications. These changes to the ERTMS specifications have been handled in the ERA Change Control Management process in the form of Change Requests (CRs). One specific Change Request, the CR1249, was raised to address problems with the pre-indication as explained in the EUG validation report published on the ERA website: “SNCF/RFF discovered in simulations for the planned equipment of the Paris – Lyon line with ERTMS L2 that the driver would see and hear the pre-indication very often. Due to steep gradients the train speed is on uphill section considerably below the MRSP speed. This results in a long time between pre-indication and indication. The consequence is that in most cases the movement authority is updated in between and the train does not enter Target Speed Monitoring. Other railways (e.g. SBB) have also reported that due to the layout of some lines, drivers are annoyed by repeated pre-indication alerts which disappear immediately due to the extension of the MA.” To assess possible solutions for this CR, EUG has used ERTMSFormalSpecs technology to simulate the intended behaviour of the ETCS on-board. With the assistance of the ERTMS Solutions’ team, it was possible to visualize the proposed changes and create videos of the simulated ETCS DMI in different operational situations.
"Thanks to the ERTMSFormalSpecs tool, we were able to present a dynamic visualization of the proposed solutions in several operational scenarios and better assess the different possible solutions. Using ERTMSFormalSpecs immensely helped in the discussions to evaluate the solution proposals from an operational perspective” Roman Treydel, Lead Engineer, EUG.
These two videos are the results of the simulations done by EUG to visualize the solution for CR1249. Each video illustrates a new display option for the DMI. In the first video, the information about the upcoming speed limitation is always displayed, rather than simply appearing shortly before the driver needs to start braking.
In the second video, a small square appears in the top-left hand corner of the screen to indicate to the driver that the train will need to start braking soon. As the train approaches the location at which it needs to start decelerating, the square grows until it fills the corner and the driver needs to apply the brakes.
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