Now, before you take this as me nagging, let me say that the lure of Trainmaster was a major reason for me to pick back up RT3 and its derivatives. And so far I've not been disappointed. I have been working on a port of the Weidenthal map. I'm thinking it's best to start small.
In doing so, however, I ran into two issues I wanted to share & run by people here. I figured I'd start a thread for that, since there'll be sure to be more questions where these came from.
1) I tried using the Theme Park. It did not demand or supply passengers when placed by event, and disabled in industries. So I made sure to enable it, and that all cargo it demands and supplies, other than passengers, finds suppliers and demanders. These cargoes now do show up in the Theme Park, but still no passengers. A station placed at an isolated Theme Park generated no passenger traffic. A second one, built manually after making the above changes, likewise behaved no differently. I ran the game for a year just to be sure. No pax.
2) I have tried in vain to get German express cars to show up. I've read every single instruction I could find on this board on that subject. They were sometimes appearing to be contradictory, but I covered all angles by placing the German_Express_Cars.pk4 in data/3d, .../poptopextracontent, AND .../userextracontent. The North American express cars pk4 has been banished to the subfolder 'Custom Packs', and yet those are the ones that keep showing up in game, exclusively.
You said that this may be a matter of the era, so to be able to control for that, could you please post here what eras are covered by the German car sets (express and troops)?