NJ Transit launches mobile app for Access Link. NJ Transit After months of teeth-gnashing and worry over whether NJ Transit would meet the Dec. 31, 2020 deadline of PTC implementation, Parsons announced today that the deadline has been met, with less than two weeks to spare. Parsons Corporation announced today that NJ Transit (NJT) has completed the final deployment of its Positive Train Control (PTC) system; an advanced, technological capability that increases the safety of rail transit and protects riders. In partnership with NJT, Parsons developed and implemented a custom PTC solution that adheres to Federal Railroad Administration guidelines, while maximizing the region’s existing rail infrastructure. This milestone is the first time NJ TRANSIT has implemented PTC.