I have just added a partial listing for the maiden voyage of the Rangitane which took place on 26th January 1950. One notable passenger on the list was The Countess of Orford (who I believe may have been visiting her daughter, or travelling with her daughter, Lady Anne Berry, although this is just a guess).
I have also found The Countess Orford on the Rangitiki in May 1949 on the voyage from Auckland, New Zealand to Southampton, UK, where her occupation is listed as “Peeress”!
The Rangitane called at Pitcairn Island on this maiden voyage but not many of the Pitcairners visited the ship. According to the book Pitcairn Island as a Port of Call, by Herbert Ford, Pitcairn postmaster Roy Clark wrote:
Yesterday a large passenger ship called here, but because it was Sabbath, not many went off to the ship, for on this day [the Sabbath] we do no trading. I think a good few of the passengers were disappointed. On these Sabbath-calling ships we do missionary work by giving away our [religious] papers.