A fast train plan to link Melbourne and Sydney will be pitched to Prime Minister Malcolm Turnbull at a meeting on Thursday.
Consolidated Land and Rail Australia is a Melbourne-based company with directors in Victoria and New South Wales that will make an "unsolicited offer" to the prime minister to better link the two cities.
The company says on its sparse website that its offer will help "reshape Australia".
On Wednesday one of the company's director, Nicholas Cleary, declined to talk about the plan until after Thursday's meeting with the prime minister.
The prime minister's office confirmed a meeting was scheduled but would not discuss the matter further.
The plan - the latest in a string of concepts for a fast rail line between the two cities floated since the 1990s - has been enthusiastically embraced by the federal MP for Bennelong and former tennis champion John Alexander.
He heads a federal parliamentary committee looking at how transport can better stimulate economic activity.
Mr Alexander said Consolidated Land and Rail Australia was genuine in its plan, which is understood to involve the firm buying or taking options on land in regional towns near where the rail line would run.
A federally funded study into high-speed rail on Australia's east coast in 2012 identified Mittagong, Canberra, Wagga Wagga, Albury Wodonga and Shepparton as likely stops between Sydney and Melbourne.
Mr Alexander said Consolidated Land and Rail Australia had links back to a major American investment group.
He said the group was one of "three separate groups who are looking at similar ideas, of securing land in the corridor between Sydney and Melbourne".
The inquiry Mr Alexander chairs is analysing the effect of light rail, metro rail and high speed rail on the value of real estate, and how to capture the increased value arising from improved transport links.
"There are a number of groups that are looking at securing their own land at the current price, funding the infrastructure and then paying for it in the uplift of the properties," Mr Alexander said.
While Mr Alexander said Consolidated Land and Rail Australia was "involved in some very, very large projects and they are a most impressive assemblage of people", company searches did not reveal any links to other major companies.
The train between Melbourne and Sydney takes 11 hours, while the air corridor between the two cities is the fifth-busiest commercial route in the world.
There have been a number of proposals for a high-speed rail line between the two cities since the 1990s. The last attempt involved an initial Sydney-Canberra link, but failed in 2000 when the Howard government baulked at its $4.5 billion price tag.
Referred to recently by one commentator as "the boondoggle that won't go away", the latest government plan for high speed rail in 2012 put the price tag for a Brisbane-Sydney-Melbourne route at $112 billion.