Adam on the roadmap stream mentioned that the preservation team will be looking at OSD soon. I suggest adding passengers to the empty platforms on Oakville subdivision. Even though there's no passenger trains on this route in game, in real life the platforms would generally have people waiting at most times. Would add to the realism and make it not seem like a ghost town.
Even better with DTG Getting GO Transit licence so that the Caltrain Baby Bullet gets a Reskin into GO Transit Paint. That's based on DTG plan to Reskin Caltrain F40PH into MBTA Purple for NEC Boston Providence.