@Hudson, there is some good news on the DCS/DCC front. All of the MTH locos with PS3 have DCC bult in already and they even automatically detect the the signal... AC/DC/DCS/DCC. That is a major reason I am looking MTH PS3 locos.
I am getting a subway but, I am working on a few parallel tracks at the same time. I am trying to get out of 3-rail to simplify things here, so I need to 2-rail those vehicles and simultaneously I am working on building new modules for a layout. I am a member of East Penn and run live overhead, so I am really interested in traction/subway/heavy electric and the more modern diesels. I also have a Christmas themed layout for the holidays, that is what prompted my question earlier about steamers, which I have no real experience with. There are some really beautiful ones out there though.
I am trying to create scenes where at least 2 of these types of vehicles interact or cross paths and control them via DCC via ESU ECoS 50200 and eventually computer control. Right now, I am in the beginning of consolidating everything to 2-rail and building the first new modern Light Rail cars and modules for them and their cousins.
Think Miniature Wunderland in O. That is sort of my goal. Obviously on a much smaller magnitude but, would like to have super details with lots of action, including Faller car adapted for O scale. THe tech is here and available, just need to figure out how to put it together.