President Joe Biden celebrated the national rail system Amtrak's 50th anniversary Friday by urging huge funding increases as part of a $2.3 trillion US infrastructure makeover.

Dubbed the passenger rail system's best customer, Biden is often called Amtrak Joe. He became famous for daily commutes between Washington and his Delaware home during the 36 years he was a senator.

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He started when his first wife and daughter were killed in a car accident, subsequently deciding to get home every night from the Senate to look after his two sons, who survived the crash.

Speaking on a platform at the 30th Street Station in Philadelphia, Biden reminisced at length about his Amtrak odyssey, calling the conductors and other staff he met over those years "family."

"Amtrak wasn't just a way of getting home. It provided me, and I'm not joking, an entire other family," he said.

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Providing Amtrak with an extra $80 billion as part of the mammoth American Jobs Plan infrastructure package would allow upgrades and expansion of routes, Biden said.

"We have to build back better and today we have a once in a generation opportunity... (for) Amtrak and rail and inner-city rail," he said.

"Make investments to get America... back on track."

Biden argued that rail networks are also part of the answer to his emphasis on doubling the US commitment to greenhouse gas reductions under the Paris climate accord. Rejoining the global pact was one of his first moves on taking office, reversing his predecessor Donald Trump's decision to pull the United States out.

"When I think about fighting climate change, I think about jobs and rail," he said.

Biden's love for trains was recognized by both the CEO of the network, William Flynn, who called him "one of Amtrak's most loyal customers," and a conductor who took the future president's ticket years ago.

"One of my first lessons my father taught me as a conductor was to look out for one of Amtrak's most frequent riders, Senator Joe Biden," conductor Blake Weaver said. "I always remembered how he treated everyone."