But on the flip side, several London Underground owned (not operated) stations are also shown in the NR statistics (eg Harrow to Amersham inclusive).
This feels like needless nitpicking for what is a few seconds adding something to a list. The Tram-Train stations are NR infrastructure on NR tracks, as is the Sunderland extension of the Metro. Nobody is asking for the West Midlands Metro to be added, which is entirely a closed, private tramway.
If someone wishes to provide a definitive list of those....
Along with a watertight definition.
The problem with any list is that people have different requirements from it and definitions of what should or should not be included.
There is rather more than a few seconds involved in adding a new entry. It has to be researched to see just how firm that proposal actually is (obviously Magna is a very firm proposal). I have a full set of Baker Rail Atlases, there are many proposals which never happened such as the Avon Metro and the Ivanhoe Line. Once included at #1 each proposal has to be reviewed on a regular basis. Negative news such as delays, postponements or cancellations rarely gets reported, hence the continued inclusion of Surrey Canal (was Surrey Canal Road or New Bermondsey) in #1.
One 'simple' expansion of the definition then leads to others. Addition of tram-train stops on Network Rail lines, then other stops served by those same tram-trains but not on Network Rail infrastructure, then routes physically linked to those previous routes but served only by trams, then networks independent of Network Rail such as Metrolink. Then there are the 'very light rail' proposals. All have 'stations' of some kind, all serve the function of transporting passengers.
My long list currently stands at 670 proposals, many of which I can completely ignore because they will simply never happen. I can live without expanding that list to include the many light railway proposals.