Survey of Positioning Technologies for In-Tunnel Railway Maintenance

Maintenance plays a fundamental role for the safety and efficiency of the railway infrastructure. This document analyzes the state of the art of technological solutions for indoor positioning, which has recently had significant developments, particularly with ultra-wide band (UWB), and can be taken into account to manage the positioning of teams of workers inside a tunnel. Based on our analysis, we argue that there is not sufficient information about the performance achievable by state of the art technologies in a railway tunnel maintenance scenario. We thus propose a set of research questions for an experimental measurement campaign in the authentic context of use.