Yea but realistically speaking, they can only make one line at a time. They all require a lot of work. It's like asking them to create the entire South London network which is numerous miles of track so not possible to do in one go
Hopefully we can get Metrolink's MP36PH-3Cs and F59PHs (their few remaining F59s are used for switching mostly). I'd also like to see a few freight engines added such as a UP SD70M, GP60, C45AH (ET44AC), or C45ACCTE (ES44AC). Maybe we could get some more BNSF power on a new Metrolink line. I'd suggest a C44-9W, ET44C4, GP60, or B40-8W. In addition, Coaster and Amtrak share some of the lines, so we could see Coaster and Pacific Surfliner SC44 Chargers and Amtrak P42DCs and P32-8BWHs on a new Metrolink line. Perhaps we could get the LA-San Diego Pacific Surfliner line. Metrolink runs on that line between San Diego and Ventura. Plus, BNSF has some freight services as well.