Using the original trains as a template, I have worked on the 4000 and 5000 series cars to the point where you can preview the BETA trains showcasing the propulsion work that's being done with them. The exteriors are aliased from the route object files folder belonging to Oren, and only serve as placeholders of more modern generation exteriors to be done in the future. Enjoy the progress:
{For Videos, scroll to the bottom of this page and beyond}
The sounds used in the 5000 series are sourced from the new R179 hosted on openbveconnect, and there was no information in the train folder as to who generated those sounds, so if permission is needed to use them, give me a shout-out here.