Global News Podcast: Greek PM: 'Unprecedented' train collision was 'human error'

The transport minister resigns and three days of mourning are declared after more than 40 people are killed in a rail disaster. Also: Guinea and Ivory Coast are sending planes to evacuate their citizens from Tunisia following inflammatory remarks by the president against sub-Saharan Africans, and the singing legend Joni Mitchell is honoured by the US Library of Congress.