Hi Katharina
The two feeds are:
There are different sets of reference data for each - the Network Rail data is more raw than the National Rail Enquiries data, so needs a different set of data to make it usable. However, the National Rail Enquiries data has concepts - such as 'via' locations and delay reasons - that aren't in the Network Rail data as they're added downstream - which probably don't match up with concepts in Network Rail.
I realise the structure and naming of NR and NRE causes confusion - does this make things clearer?
Kind regards,
Peter