GDC approves SEP agreements with Amtrak and NJT for HTP, US October 18, 2023 | News, North America News The Gateway Development Commission (GDC) has approved Supporting or Executing Partner (SEP). GDC has received in-principle support from the Port Authority of New York and New Jersey (PANYNJ) to carry ... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password