An internal brawl in the Nationals over the Federal Government's Inland Rail project is threatening to fracture the party, two days before its leaders could lose their jobs.

All Queensland Nationals backbench MPs and senators have put their names to a letter to Infrastructure Minister Darren Chester, demanding a rethink on how the project is being run.

The letter is a contentious move at a tense time and it has left some senior Liberals fuming.

Nationals leader Barnaby Joyce, his deputy Fiona Nash, and senator Matt Canavan may be unemployed on Friday if the High Court rules they were ineligible to stand for Parliament because of dual citizenship.

The letter, which has been received by Mr Chester, has Senator Canavan's name to it.

Mr Chester, one of the most senior National Party figures in Parliament, is not caught up in the citizenship saga.

Some in senior Liberal ranks are concerned his colleagues are making the Nationals look more unstable at a difficult time.

But Mr Chester said the party was united.

"While some may be focused on internal machinations, out there in the real world they want to know how you're going to build this rail line, how you're going to maximise the benefit, and will it impact on me and the community," he said.

"So what happens inside this building doesn't matter so much to me as what happens on the ground."

Inland Rail fury

Queensland Nationals are fuming over the direction the Inland Rail route will take, and farmers have labelled the consultation process a farce.

There are concerns the company tasked with building it, the Australian Rail Track Corporation (ARTC), is not up to the job, and that the cost of the $9 billion project could blow out significantly.

The letter from Nationals MPs and senators to Mr Chester read:

"We are now requesting you to make a public statement, which confirms that the Wellcamp/Charlton alignment may not be the final corridor."

They also called for a more "transparent process" from the ARTC.

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