The Baltimore & Ohio (now part of CSX) was the parent of the Reading. There is a tunnel in Philadelphia where track to the south was B. & O. and track to the north is Reading. The Central of N.J. did not have a track to Atlantic City but was the daughter of the Reading (and granddaughter of the B. & O.) Their track ran from the New York City area to Delaware Bay and some trains ran on the Reading-controlled track to Atlantic City.