Not sure if these are here already (in TS2021, not TSW or TSW2). If I find out they are in the game I will delete this thread.
For TS2021 - a set of the Viewliner cars came with the P42DC Silver Star in DTG's Miami - West Palm Beach route. https://store.steampowered.com/app/277752/Train_Simulator_Miami__West_Palm_Beach_Route_AddOn/