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050 Inspection of track fasteners

Published: 8 February 2017

Automating the detection of missing rail fasteners, using a system based on measurements of the magnetic field.

The lack of rail fortifications detected and recorded in the current situation manually via visual inspection. These inspections require that the fortifications are visible, which is not always the case, especially during winter. This project aims to automate the detection of missing the train fortifications, using a system based on measurements of the magnetic field, so that the more time-consuming visual inspections can be replaced with a more frequent method. The contemplated system for detection of fortifications based on a previously developed by Bombardier product (Lindo meter) for measuring the speed of the train, but in this project should be used for the detection of missing fortifications. The project includes construction of a suitable test route in the fields and the construction of a way of food for the measurement system. The project will be different types of defects related to fortifications and even rail analyzers using the proposed measurement system.


Construction of the test facility required expertise in railway construction. As the resources of this type of expertise is heavily loaded out in the field broke the original timetable.

Increased skills and knowledge in the measurement of eddy currents for railway applications have been received and an increased knowledge of how magnetic fields vary for different types fortification. The collaboration between LTU and Infranord worked brilliantly in which staff from Infranord assisted in the design of the test facility. Transport Administration Staff also made a significant effort to locate the right kind of components for the test platform. Bombardier has been anticipating and preparing meeting with a company with expertise mätvagnskonstruktion although this responsibility has been on LTU

As this was a relatively small project with a limited number of operations has the control and management work force functioned smoothly in a spirit of consensus. The operational work has been done in small groups to solve each part. All participants have demonstrated a commitment and willingness to solve project objectives.

Project leader: Matti Rantatalo, Luleå University of Technology,

Project partners: Luleå University of Technology, Bombardier Transport Administration