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There are national-level international rail journey datsets available, but this regional dataset has the benefit of collecting information from both the origin and destination country, which means that less data are unavailable due to confidentiality (as long as one country publishes the figures, then they are visible). Data can thus be visualised, but given the large number of connections with very small numbers of passengers, some filtering makes sense. The picture below shows a map with all flows greater than 100,000 passengers a year. The map shows, for example, interesting difference sin traffic between France, where most flows connect with Paris, and Germany, where the flows are much more spread out between multiple large cities.

This map can be browsed in an interactive format at https://rpubs.com/BlackburnStat/689627.

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