The Los Angeles Metro Rail would honestly be a good route and another route that includes union station winch will help the devs sense it a used station already in other routes and will save time and it includes a lot of Los Angeles to see so it would be a pretty fun route
From what i was told LA Metro isn't considered commuter rail, DTG is mostly focused on Cummuter rail and frieght routes light rail is out the question as much as I would love it its not happening