Try trainzluvr.net, there are SEPTA coaches to download with rideable interiors, they look almost like the silverliners, but no pantographs although the cab car is like a locomotive. You could use those for now. They're called King commuter coaches I think. Jaleel made those, too. You could also make an AEM-7 electric loco and use them as coaches with a cab car at the opposite end. SEPTA does that in addition to the silverliners, a push-pull trainset with an AEM-7 at the one end usually for rush hour trains on the AMTRAK lines SEPTA runs on. Very rarely on the ex-Reading lines toward Norristown, Lansdale/Doylestown, etc. They were delivered to SEPTA in 1987. The coaches were made by Bombardier. Years ago, until mid-1981 Conrail/SEPTA ran RDC diesel trains on ex-Reading lines to non-electric destinations like Reading, Bethlehem then the RDC's were retired and sold to other railroads like BC Rail, MBTA, tourist railroads, etc.. The last RDC run was in early 1983 on the Newtown line. They also ran an FP7 push-pull trainset on those routes. The 5 or so coaches are in Danbury, CT and the locos are at Strasburg, PA painted in Reading and were used on Emmaus-Pennsburg excursions in recent years. Conrail turned commuter operations over to SEPTA in 1983. By that time, it was all electric. NJ Transit still runs diesel trains, though and almost every other commuter railroad in the US.