Federal Opposition Leader Bill Shorten will back the controversial Cross River Rail project with a $2.24 billion cash splash.

Mr Shorten will travel to Brisbane on Monday to announce funding for the state Labor-backed project, News Corp reports.

Bill Shorten is also expected to reveal Labor will match the prime minister's $1 billion promise to widen sections of the M1. Credit:Dominic Lorrimer

The funding would include $800 million towards the construction of the $5.4 billion, 10 kilometre line between West End and Bowen Hills, and would provide a 50-50 split for the running of the project.

Annastacia Palaszczuk's government had previously committed to funding the entire project by itself after it was snubbed by the Turnbull government.