Man, that sucks. I try to commute once or twice a week, don't have to take SART but if don't feel too tired I do to add miles. Few days ago I was just thinking how nice and peaceful would be to take a long ride in the dark.
Right know I have a temporary job (thanks to Obama) where we provide help to low income families in oc, this has led me to experience Santa Ana more than I ever wanted to do

Most cockroaches' activity stems from the mobile home parks around 1st and the River Trail. I'd start by posting reward signs w/ pics around there.
Crime there is a matter of opportunity which leads me believe they *have* to live in close proximity to the SART.
Good luck.