Not so much railway items, but related in many ways, I have been preparing to build a diorama of a German city with a bus station. As such, I have bought a few building kits and a couple more HO road vehicles to go on the diorama, in addition to the existing buses and coaches. I also took to the front axles of a few vehicles to "steer" the front wheels a bit.
The Rietze Neoplan Cityliner was available at a very reasonable price and I liked the colour. A quick Google search found that this company does tours and excursions all over western and Northern Europe, so could easily appear in a 'generic' German city.
The Bus Station kit was a self-coloured plastic kit from Vollmer, but I decided to paint everything anyway to remove the plasticky effect. I flooded some dilute dark grey into the glazing to highlight the framework. I created some artwork of my own for the more modern bus stop flags, rather than using the ones from the kit. They didn't print quite as well as I had hoped, so I may have another go soon, with thicker line borders. The Mercedes eCitaro bus is a Hamburg-based vehicle (I think I may have seen it in service) named Elton, soon to be joined by an articulated version the operator named Eileen. The large corner building is from Kibri (but both plastic kits had instructions carrying the names Kibri, Vollmer and Viessmann, so I gather they have merged). I painted the roof and some of the fittings, but some of the multi-coloured components were too fiddly to do that. The plastic colour density is good though. I also added an arched brick roof for the internal arcade.
I have some more modern large buildings too use as well, built many years ago and used on another diorama which was dismantled long ago. There is another kit, this time from Faller, on the way for a couple more German-style city buildings. I intend to include a bit of static railway along one side or across a corner, to display a couple of models too. This may take the form of a modern concrete viaduct, or an older brick or stone arched type.
I hope this shows where my ideas are going with this. All of this going on a piece of 9mm MDF, and will have to be completed by the beginning of December so I can enter it in the annual modelling competition of the Model Bus Association of Australia. I will post a few pictures when it is completed.