This is strictly from observation on my part from playing TSW2, but besides noticing that the bilevel cars in Peninsula Corridor uses the new controller set up, a few things along the route here and there have been changed. Like a new siding track just south of San Mateo and freight cars just outside of San Fran there there weren't any in TSW2020. It looks like we may indeed see fixes to the old routes when getting ported over. Let's see when LIRR releases....