Modern society demands cheap, more efficient, and safer public transport. These enhancements, especially an increase in efficiency\nand safety, are accompanied by huge amounts of data traffic that need to be handled by wireless communication systems. Hence,\nwireless communications inside and outside trains are key technologies to achieve these efficiency and safety goals for railway\noperators in a cost-efficient manner.This paper briefly describes nowadays used wireless technologies in the railway domain and\npoints out possible directions for future wireless systems. Channel measurements andmodels for wireless propagation are surveyed\nand their suitability in railway environments is investigated. Identified gaps are pointed out and solutions to fill those gaps for\nwireless communication links in railway environments are proposed.
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