[openrailwaymap] France and European longest straight stretch of railway line

Hi, I’m currently working on a project with the French rail operator aiming at tracking the trains thanks to GNSS, INS and railway digital map fusion. The system works better when the train moves on curved tracks with a low radius of curvature. Considering that the tracks are in a straight line when the radius of curvature is above a defined threshold (such as 10 km) has anyone tried to identify the France and European longest straight stretch of railway line from OpenRailwayMap data? Regards, Pierre d’Harcourt