Downloading Mojave Sub now, just to do a better comparison. And I did get the TANE update to SP3. I did notice on a Dash-2 that the Indy brake works much better (more realistic) in TANE than Railsimulator Train Sim 2020. I DO realize that folks here are much more into the graphical interface. My original question though was the difference between TANE and TS2019. I understand it is a different graphic engine. TRS19 has the original graphics engine plus the "PBR" addition while TANE is the new E2 engine. IS IT THE SAME COMPANY / DEVELOPER?
N3V is the developer of the E2 engine and developer of the Trainz versions. This is a proprietary 64-bit engine aimed strictly at train simulation. TRS19 is a new version of Trainz and is of course based on the same underlying code that is in T:ANE - why reinvent the wheel if not everything is going to change. This is not uncommon with a lot of software development including operating systems (Windows, Linux, OS/x), and other programs.
The E2 engine was developed from the ground up for train simulation, as mentioned. This came about because the developers could not find a commercial game engine that would support their open-ended environment as they went about looking for a replacement for the venerable Auran Jet game engine first developed in the early 2000s. Yes Trainz has been around that long! Like a lot of "engines", the old Auran Jet even at version 2.0 was well beyond what it could handle. Like an old car, things were bolted on that never were thought of when the program was first developed, repairs were made, but like things that were bolted on it didn't work well. There were other issues too such as the limitations of the 32-bit code that prevented optimal memory and processor usage, graphics limitations due to the older DX9 version, and other things such as thread-locking, process-locking, etc., that caused performance problems.
These changes, of course, exposed a lot of underlying flaws in older assets which have been updated, and that update process is still ongoing. There's a dedicated group of volunteers who work with N3V developers and customer support to repair and update all existing older assets, that can be repaired, that are currently on the Download Station (DLS). This is an ongoing process that will be in progress for sometime given the nearly half million assets on the DLS to date.
In TRS19 outside of the graphics changes, there are some improved logic and code-threading improvements over and above what came about in T:ANE as well as additional changes to accommodate future updates such as what is seen now in the test-version of TRS19 - aka TRS2019-Plus. These changes include the unified Surveyor-Developer interface (It's still a bit buggy now), an upcoming multi-user surveyor which was tested two years ago separately but is still in development, as well as other improvements that are planned for the future.
With that said, T:ANE as a product is not dead even though it's an earlier iteration of the same technology. There are service packs planned along with hotfixes as they are needed. Right now there's a service pack in beta to be released soon(tm) for public consumption. You can try the SP4 if you wish by changing your update options in the Launcher.
At this point in the game, no pun intended, you are coming in at the right point. T:ANE and TRS19 are the best versions to date.