Analysis of information sources in references of the Wikipedia article "List of ships sunk by submarines by death toll" in English language version.
On that morning the Leinster carried about 180 civilians, 77 crew, some 500 soldiers and 22 postal workers. ... One hundred years on, the records of how many were on the Leinster are still being probed and the death toll updated. As of six weeks ago, the figure stands at 564.