Hello Macan, I have bought some PTP add-ons and they work excellently on my TRS2007 German version of Trainz. Don't forget that Blue Sky also make stuff for RailSim, so, just be careful when choosing your routes, make sure they are for Trainz. I am unsure if their layouts run on TRS2004, I thought they were for TRS2006 SP1 and TRS2007, I don't know if they are OK for TS2009, you will have to look carefully.
I have the S-Bahn Leipzig and the Dresden-Nurnberg doublepack, and although some Germans say that the various buildings are not in their correct positions, or, prototypically built, I've ignored some of their comments as it doesn't make any difference to the operational function of the routes....
Cheerz. ex-railwayman. :wave: