Of course, there are enough English engines left, and I´d also love to see a Trevitick run the rails again, but maybe this can give you an idea on how steam locomotive development on the European mainland took place.

If you are gonna keep going with the early and experimental locomotives, is it possible that you will also make some early loco´s from outside England?
A couple of suggestions:
France: Marc Seguin, first succesfull locomotive build in said country, named after its creator. Rather interesting considering it used gigantic fans build on the sides of the tender to blow the steam.
Germany: Saxonia/Phoenix, first engine build completly in Germany by J.A. Schubert, and its later sister engine, practicly identical.
Beuth, first engine produced by the famed Borsig locomotive works. A 2-2-2 wheel arrangement, although it has a coupling rod between the drive wheel and the rear wheel.

Austria: Ajax, claimed to be the oldest locomotive preserved on the European mainland.
Sudbahn class 23 (old), a class of 0-6-0 goods engines build between 1860 and 1872, totalling 205 engines, 4 of which are preserved. One of these engines is the current GKB 671, the longest serving steam engine in the world.
Belgium: Pays de Waes/Land van Waas, an old 2-2-2 preserved in Belgium, and the oldest locomotive from that country still in existance.
Switserland: Genf, (it´s a crime this one isn´t in the game yet) the oldest running steam locomotive of the Swiss, build in 1858. Build to the Engerth principle.

Albrat your link is TPF1 and dated 2017. However it does have a TPF 2.

Steve, If you at look at videos of TPF2 you'll see TPF1 items. 3d modelling will be identical. There may be some software changes; possible dds changes. Porting from TF to TPF was just a matter of changing the 'info' folder to 'mod'. There were few other tweaks. It was much simpler than some made it out to be. One can hope DDS files will be the right way round for instance. One can hope for more than a very basic audio system with deceleration instead of the current acceleration in reverse which doesn't work well.

Information for modders of TPF2 :- https://www.facebook.com/TransportFeverGame/posts/official-wiki-and-mod-specification-releasedthe-wiki-gives-background-informatio/1848846132035771/

from what i found out, it seems his mods are actually being prepared for TPF2

or at least planned for TPF2

not sure you have to ask him for tips, but i found out from reading description of his mods
but he is definitely changing his mods for TPF2

How is he doing that without a copy of the game?

even velvatmafia is already transferring his mods

you won't be wasting your time steve, i assure you because in the trailer, you can see many of the same engines which means that it's possible

I have plans to do many early locos, however with TPF2 coming out, I am going to focus my efforts on making mods for that when it does arrive. If the mods are not transferrable, I'd just be wasting my time.

Damn Steve, these are wonderful! And with the early wagon set of yours, they are pretty damn useful, both as mainline and branchline engines for the years up to 1870! Say, could I ask you something? I've been waiting for the German community to produce this, but they have yet to actually make a move, so maybe you could try your hand on it: The Adler, a Stephenson Patentee 2-2-2 engine, it was the first steam locomotive to run in Germany, and having that one in the game would make a great start for any German player (of which, I am sure, there are quite a lot out there).

Indeed HexAyed, what could be more appropriate for my Let's create Manchester youtube series?

Whooo, More Manchester area workhorses