The Federal operated without interruption through World War II, also avoiding (barely) the yearlong 1945 Office of Defense Transportation ban on sleeping car routes less than 450 miles, though the train's intermediate sleepers such as Philadelphia-Boston and Washington-Providence were so affected.
Penn Central, formed in 1968 from merger of the PRR and the New York Central, became the operator of the entire train in 1969 when PC's court-ordered purchase of the New Haven took effect.