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Today, trains are equipped with up to seven different navigational systems. Each is extremely costly and takes up space on-board. A train crossing from one European country to another must switch the operating standards as it crosses the border. All this adds to travel time and operational and maintenance costs. Together with other technical differences ? for instance in terms of rail gauge, electricity voltage, rolling stock design, etc. ? the existence of more than 20 train control systems in Europe has always b...