The railroad you're referring to through Mt. Laurel, etc should be Conrail's Pemberton Industrial Track...the former PRR "back road", which Chuchubob has made famous here and elsewhere through his extensive photography. Runs now from Park Avenue in West Merchantville to Mt. Holly...formerly ran to Pemberton and beyond. Now traversed three times weekly, by Conrail's CA-20 local from Camden. Most major customer certainly the Hainesport Industrial Park in Hainesport, a customer there which happens to be filled with controversy these days due to what some would consider "illegal" practices...
As for other railroads, one of which comes to mind is the NJT River Line, former Conrail Bordentown Secondary and former PRR Bordentown Branch.
Part of the Robbinsville Industrial Track should also be in Burlco, controlled by Conrail...that's up off of the River Line in Bordentown. Used to be Conrail block station ROB back in the day of the Bordentown Secondary...
In terms of abandoned railroads, I believe a portion of the ex-CNJ Southern Division ran through the pine barrens in Burlington County from Winslow to around Chatsworth or so...this became Conrail's Southern Secondary until it's demise in '78...
Bob's probably got photos of all of the above...maybe he'll share some with us here...
That's all that's popping into my mind for Burlco...
Mike DiMunno
~Mike DiMunno
CSAO Beesley Point Secondary - MP 8.69 (Magnolia, NJ)
Moderator: Pennsylvania-Reading Seashore Lines :: Penn Central
