The United States is going to spend $84 billion on rail infrastructure upgrading is rail lines opening mothballed rail lines as they have realised that rail drives the economy of the country, after years of government policy turning its back on rail transport passenger and freight in favour of road transport.
The Chinese have realised the exceptional value of rail and the importance it plays in the economic development of the country and will be the only country in the world with the largest high speed rail network.
Most of that cost in the US is by private funds as it is in the best interests of the railroad that owns the trackage. And it's only a small handful of abandoned lines that are re opened, usually for a short distance for a good reason, generally without government funds. In the past 30 years over there they have consolidated routes after various mergers into the big 7 they have now, so a bit of abandoned trackage was unnecessary.
Also in the US, government has SFA to do with rail. Like making the federal rules, and some county rules maybe? But other than that the railroads lay their own path.
With the comment about government turning its back on passenger, the federal AMTRAK plays second fiddle to any freight except on the AMTRAK run NE Corridor (only part of AMTRAK making money).
Plus the last part of that second sentence makes no sense.