Track geometry assessments

PUPIL is a sophisticated software tool that simulates the dynamic interaction between the rolling stock and infrastructure (known as vehicle response analyses). It uses a digital twin of the vehicle types running on the network and the track condition data that was captured by measurement vehicles.

The tool examines a selection of vehicle types across a range of variables such as differing speeds and loading conditions. The track geometry is evaluated using calculated vehicle reactions and provides an assessment on track forces, Y/Q safety against derailment coefficient and car body accelerations.

• Assessment of track geometric quality (level, alignment, cant, twist) by means of calculated vehicle reactions.
• Safety assessment based on EN14363 quantities: safety against derailment, track loading, car body accelerations.
• Library of 20 vehicle types: passenger trains, locos, freight wagons.
• Assessments include multiple defects on the same location and periodic defects (such as cyclic top).
• Maintenance advice showing cause of safety exceedance.
• Speed-dependant assessment. In cases of exceeding safety limits, it provides advice on safe speed (speed restriction).
• Track specific assessment possible (e.g. freight high speed, local) thus reducing unnecessary maintenance actions.
• Fast processing due to smart model reduction.
• Compatible with standard output of measuring cars.

• Assessment of track geometric quality (level, alignment, cant, twist) by means of calculated vehicle reactions.
• Enhanced safety performance across your network.
• Reduced costs through preventive maintenance processes.
• Increased track capacity by intelligence-informed advice on safe speeds limits.
• Higher passenger satisfaction through improved ride comfort.
• Compliance to EN 13848-1:2019.
• Easy implementation.