METRO project provides safer underground railways

Published:  10 December, 2012

Congested roads and railways render underground transport systems more popular. But more tunnels lead to greater risks of serious accidents where it can be difficult to evacuate travellers in a short time. Now the results of the three-year research project METRO are to be presented.

Underground railways are complex systems, with a lot of people in a small space. This complicates both evacuation and rescue work when accidents occur. How quickly a fire spreads is the decisive factor for the time the travellers have to be evacuated from the area safely.

The project is unique since many organisations, with different skills, work together to make underground railways all around the world safer. The project has shown that fires in trains can be greater than previously anticipated, but also that the development in the design of trains and the choice of materials is progressing in the right direction. The right choice of materials can make a big difference, says Mia Kumm at Mälardalen University.

The final results are to be presented at an international seminar at Rosersbergoutside Stockholm on 10 and 11 December. More than 160 participants from 20 different countries will be attending.

 Some of the most important results from the research project are new design fires for underground stations and tunnels, new knowledge of how quickly people can be evacuated from trains in tunnels, what difficulties are encountered by disabled persons in evacuation situations, how the design of trains can be constructed to decrease the risks of personal injury in case of explosion, and what possibilities and limitations there are in rescue operations.

The project has demonstrated that it is very difficult to find your way in smoke-filled tunnels, but we have also identified a number of guidance systems which efficiently help people to find the right way out. One interesting discovery is that even simple systems based on sound signals work better than many of the conventional systems used today, says Daniel Nilsson, at the Department of Fire Safety Engineering and Systems Safetyat Lund University.

In the autumn of 2011, full-scale fire tests were carried out in one of the Swedish Transport Administration’s abandoned tunnels outside Arvika. In a global perspective, few full-scale tests have been carried out since they require large financial resources and a comprehensive organisation. When constructing new buildings different computer models are often used to simulate fires and the spreading of smoke. Full-scale tests are invaluable in being able to verify these models and make the calculations more accurate.

Trains today have good fireproofing in themselves, but the cargo can be the factor which has significance for whether the fire develops into a flashover at all. Something which has also been shown to have a decisive effect is whether the train’s doors are open or not. For example, the gap between the train and the platform can have a big influence on both the spread of the fire and evacuation, says Professor Haukur Ingason at the SP Technical Research Institute of Sweden.

  • Operation Florian

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