ČSN EN 13848-4

This document specifies the minimum requirements to be met for track geometry measurements by lightweight devices including track geometry recorders working up to walking speed and track geometry instruments to enable the assessment of track geometry quality using one or more of the parameters described in EN 13848-1. In the case of lightweight devices working at a speed higher than walking speed, or in the case of track geometry measuring systems installed on vehicles but not measuring in loaded conditions as specified in EN 13848-1, the validation of the system can be done based on the test procedure specified in Clause 6 of EN 13848-2:2020.