News Corp is axing its free afternoon commuter publication mX as readers continue their migration from print to online.

The Rupert Murdoch-controlled company said on Thursday it would close the daily newspaper, which is distributed on train platforms and other CBD locations in Melbourne, Sydney and Brisbane.

Staff have been told the publication will cease in two weeks.

"News will continue to invest in our extensive suite of print and digital products, which are purchased and read by millions of Australians every day."