I Know The Peninsula Corridor Needs An Update Fixing The Bugs And New Sounds For Caltrain For And New Horn Bell
I think it’s best for the sounds to work (Audible) on a “certain” (F40) caltrain train before getting better hearing it’s like turning up a volume on the TV whilst leaving it on mute
If updated, the Peninsula Corridor needs electrification (that is being added sometime), some more freight action, and a few new engines. I'd suggest a UP GP60 (or GP62 rebuild) or a GP22T4 (rebuilt GP38-2), along with (possibly) an SD70M, SD59MX (rebuilt SD60M), SD70AH/SD70ACe, SD70AH-T4, C45ACCTE (ES44AC) or C45AH (ET44AC).