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Reads a data file as provided by 'Deutsche Bahn' (for internal use).
read_DB_data(file)
data.frame with variables 'node', 'time', 'delay'
data.frame
'node'
'time'
'delay'
character with path and file name containing the variables for 'stationID', 'date', 'hour', 'minutes', and 'delay'
Other data_handling: aggr_data()
aggr_data()