https://trainlogger.co.uk/units - this link has a list of trains on order, although it may be out of date. NR are going to need a bi-mode or Diesel option you'd think, unless they order a 730 that can be dragged around as needed. Hitachi's greater length would restrict options for the very twisty branch lines, but the 897s may be suitable if one set can be shortened appropriately.
The 730/2s are about to enter service in June 2025, but I think Alstom Derby are winding down Aventras after the second batch of 345s (10 more units from Alstom, not the for-some-reason separately mentioned 10 from Alstom and 9 from defunct Bombardier), to build any Adessias instead (I believe they're hoping Southeastern will order some). As for the mention of a cancelled order for hydrogen Aventras, sure... I guess the site just wants a record of it. As for them (normally) being electric-only trains, I believe Alstom said they'd build battery/overhead electric bi-mode, or even diesel/battery/overhead electric tri-mode trains if I recall correctly, but they were less keen on building diesel/overhead electric bi-modes.
The 810s have been undergoing driver instructor training and are also due to enter service around the end of 2025 / beginning of 2026, following the training of the normal drivers. However, Hitachi may not want to make another AT300 with "short" vehicles, due to them having more issues than conventional AT300s.
Most 805s and 807s have been in service, but more conventional AT300s have been ordered by First Rail open-access (Hull Trains / Lumo, not only Lumo as mentioned) and Grand Central (the former are mentioned as Class 804, but this is
not the case as they've not yet received a class number - on the other hand, correctly, no class number is mentioned for the latter).
65 (of 77) 197s have been in service, and at least 74 are now believed to have been built. That site/page doesn't seem the most in accurate in general, as it states Chester
and Machynlleth as depots even for 3-car 197s - Machynlleth will only have some 2-car 197s. I believe CAF Newport will assemble 8 of the 897s once 197 assembly has completely finished.
93s / 99s - I guess Network Rail could order some Stadler locomotives in general if they wanted/needed some. I'm not really familiar with the wagons / specialist vehicles they'd haul, but don't Network Rail have some fairly new ones of those anyway, and if they needed
new new ones, they'd know how to acquire them?
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The Stadler 398s are doing daytime test runs in the South Wales valleys and are due to enter service around the end of 2025 / beginning of 2026. They're bi-mode (battery/overhead electric) units, but I'm guessing Network Rail aren't going to want tram-trains
HS2 trains - the "due" date of 2025 is no longer correct - I'm not aware of their build having even started yet. Also, even if they weren't electric-only, they may be a touch overkill for Network Rail, and they're not a standard product anyway, as they'll be a product of an Alstom-Hitachi joint venture.
23 (of 46) Stadler 555s were built as of June 2024 (and 5 have been in service), but, like the 398s, I doubt Network Rail would want these metro trains. Also, they're overhead electric, and the wrong voltage and electricity type for the National Network. Yes, that could be changed, but no point if they'd be unsuitable anyway.
CAF B23s (to supposedly enter service "in 2025") and Siemens 24TS (planned to enter service "in 2025") - like the 398s and 555s, I highly doubt Network Rail would want either of these! And again, electric-only of course, and like the 555s, there wouldn't be any point in changing the power input (from third rail and fourth rail in these cases).
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