Biden used the third and final day of his visit to Angola on Wednesday to showcase the Lobito Corridor railway, where the U.S. and allies are investing heavily to refurbish 800 miles (1,300 kilometers) of train lines in Zambia, Congo and Angola.

The project aims to advance the U.S. presence in a region rich in cobalt, copper and other critical minerals used in batteries for electric vehicles, electronic devices and clean energy technologies. By the end of the decade, the rail line could even go a long way toward linking southern Africa's western coast with the continent's eastern edge.

"I'm probably the most pro-rail guy in America," Biden, the first U.S. president to visit Angola, said during a speech Tuesday evening.

Biden has long had the nickname Amtrak Joe for the 36 years he spent commuting by U.S. train from his home in Delaware to Washington while in the Senate. He said the Lobito Corridor constituted the largest U.S. investment in a train project outside the country.

On Wednesday, Biden flew from the Angolan capital of Luanda to Lobito on Africa's western coast to tour port facilities linked to the corridor with Angolan President Joao Lourenco, Zambian President Hakainde Hichilema, Congolese President Felix Tshisekedi and Tanzanian Vice President Philip Mpango.

The leaders also planned to meet with representatives from companies that stand to benefit from the corridor project, including a telecommunication firm expanding cell service in the region, a food-production firm and Acrow Bridge, a Pennsylvania company that makes prefabricated steel bridges and has a contract to deliver nearly 200 to Angola.

Biden would also see an American General Electric locomotive used for cargo on the Lobito Atlantic Railway, the White House said, with the U.S. promoting the railway upgrade as a catalyst that it hopes will spark a new era of Western private sector investment in this part of Africa.

The Biden administration says the rail corridor will help business interests and counter China's growing influence in Africa. His long-awaited first trip to sub-Saharan Africa as president came in a week where trade tensions between the U.S. and China over rare minerals needed in new technologies went up a notch.

In Lobito, Biden will announce $600 million in new U.S. investment for projects associated with the corridor, which has also drawn financing from the European Union, the Group of Seven leading industrialized nations, a Western-led private consortium and African banks.

Biden toured the Lobito port that will provide an outlet on the Atlantic Ocean and ideally a route to the West for Africa's minerals and other exports. Under a towering blue crane, a banner read: "The Lobito Corridor Connecting Africa from the Atlantic to the Indian Ocean."

Biden announced that Congo had also committed a new $553 million direct loan to the railway to upgrade and operate more than 1,000 kilometers of line from Lobito to the Congo border.

The administration says it currently can take cargo loads of materials about 45 days to get from eastern Congo or Zambia to the market and usually involves going by truck to South Africa. Test loads run using the new rail corridor made the same journey in around 40 to 50 hours.

China, meanwhile, already has heavy investments in mining and processing African minerals and has used its Belt and Road Initiative infrastructure strategy to promote its economic and political influence around the world.

In September, China said it had signed a deal with Tanzania and Zambia to revamp a separate railway line going east from Zambia to Tanzania's Dar es Salaam on the east coast of Africa.

The countries had previously worked together to build the railway line in the 1970s, but it fell into disrepair. China's move to renovate it -- announced on the sidelines of this year's China-Africa forum -- is seen by some analysts as the Chinese response to the Lobito Corridor.

A senior U.S. administration official called the Lobito Corridor the heart of competing with China, not as a political adversary but from a business standpoint.

The idea is rather than pumping in aid, Washington will attempt to grow U.S. influence by promoting projects that can spark investment and therefore help communities and countries over the long haul. The Lobito Corridor has become a model approach that the U.S. is looking to replicate in other parts of the world, said the official, who briefed reporters during Biden's Angola visit on condition of anonymity to offer project details that haven't yet been made public.

The corridor won't be completed for years, meaning much of the continued work would come during the administration of Republican Donald Trump, who takes office Jan. 20. The Biden White House says that Republicans in Congress and elsewhere have supported past efforts to promote African business interests through targeted investments and that such initiatives have appealed to Trump and his key advisers in the past.

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Associated Press writer Gerald Imray in Cape Town, South Africa, contributed to this report.