Apologies if this has been asked here previously; I am not a frequent visitor to the Septa page. Is there anything structural that precludes tracks 0, 5, 6, and 7 from being extended eastward? I'm curious as to whether or not those tracks could be extended to Camden and then hooked into the south jersey rail network to bring commuter service to an area or two (without having to take the grand tour of North Philly). Obviously they'd have to dive down to get under the tracks that are RR east of Market East station, but I'm guessing there's not much in the way that couldn't be relocated (ie, utility infrastructure). Suburban Station though, I'm not sure as I'm not familiar with it (haven't been there in at least 7 years).