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On most railway sections, however, fencing still may not be cost-effective. Preliminary analyses of the Swedish railway network suggest that there are at least 10 railway sections with very high WTC frequencies where fencing would be economically viable today. Thus, the number of collisions with larger wildlife, especially ungulates, per kilometer, is greater on railways than public roads. This is similar to the costs estimated for wildlife-vehicle collisions on roads (250,000,000 Euros per year) (Seiler and Olsson 2015), despite railways comprising less than 2% of the national road network. The overall socio-economic costs of WTCs in Sweden have recently been estimated at 100,000,000–150,000,000 million Euros per year (Seiler et al. These trains are less robust than traditional single train engines and require more expensive repairs after a WTC, sometimes leading to significant delays in railway traffic.
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This attitude, however, is changing as train operators upgrade their train systems to modern light-weight multiple-unit trains. Except for a few railway sections in the northern region, where accidents with semi-domestic reindeer lead to expensive reimbursements, fencing has long been regarded as economically unviable for railways, and alternative measures have not been seriously tested. However, since WTCs do not cause human injury or death, and hence are not considered a traffic safety problem, the Swedish railway network is still largely unprotected against collisions with wildlife. Traffic accounts for about 10–15% of all human-caused mortality, and the proportion is increasing.
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Trends in moose and roe deer reportedly killed on roads, on railways and through hunting. WTC can cause significant disruptions and delays to train traffic produce considerable repair costs for material damages and entail further costs related to the retrieval and handling of animal carcasses, the loss of other economic values of wildlife, and the administration of accidents (Child and Stuart 1987 Jaren et al. WTCs receive increasing public media attention and their importance is also acknowledged by train operators and the Swedish Transport Administration (Olsson and Seiler 2015). The number of unreported WTCs, as well as the number of collisions with smaller mammals and birds, is unknown. 17.1), totalling about 5,000 reported incidents with moose ( Alces alces), roe deer ( Capreolus capreolus), reindeer ( Rangifer tarandus), and other ungulates (fallow deer, red deer, wild boar) every year (Seiler et al. Wildlife-train collisions (WTC) on Swedish railways have steadily increased over the past 15 years (Fig. The project was begun in 2015 and will continue for at least 4 years. If effective, these deterrent systems could replace fencing and/or crossing structures, and reduce mortality and barrier effects on wildlife. This will be carried out at several experimental crosswalks for animals along fenced railways where the effect of different signals on animal behaviour can be evaluated. This project aims to develop warning or deterring signals that encourage animals to leave the railway shortly before trains arrive. In this chapter, we present research on WTC in Sweden that has been used to define the baseline and set up criteria for a new mitigation project. The Swedish Transport Administration is therefore seeking innovative and cost-effective measures for preventing collisions with larger wild animals. Nevertheless, railways are largely unprotected against wildlife collisions, and mitigation measures that have hitherto been applied to roads are either infeasible or economically unviable for railways. Wildlife-train collisions (WTC) are rising in numbers and railways appear as a greater source of ungulate mortality per kilometer than roads. In contrast to collisions on roads, accidents involving wildlife on railways do not entail human injury or death, but can cause substantial train damage and lead to significant delays in railway traffic. Since reliable accident statistics and consequent costs have become available, train collisions with wildlife, especially ungulates, have received increasing attention in Sweden.