US has the largest railway on earth by a large margin
Largest freight rail. Public transport for normal people is still shit compared to Europe.
But how much of it is electrified?
How fast does it move? How's the latency?
This is kind of a dumb statement. Yes the US is one of the larges most populated countries and has been for a long time. Its just coping instead of actually engaging with the question about what makes railways good. The US put down lots of track in the 18-19th centuries as its industrial revolution was pre-car and its the biggest country where this happened.
If you look into detail and not just very simple 'we transport this much cargo' you see the US system has many disadvantages and is not nearly as amazing as some US people barging make it seem.
Frankly given the historical strength of railways in the US into the 20th century, the near perfect geography for rail and the lack of ports its quite embracing how little things are done with rail.
US annual freight tonnage per annum is much the same as Australia's (1.5 billion tonne /annum, IIRC).
Australia has longer, more control complex trains (leading, trailing and midway locomotives).
To the best of my knowledge the US has never once had a single train 7 km in length with 680+ cars and a gross tonnage of 99,734 tonne - Australia has set a record with such a train and moves smaller (but still at that scale) trains daily.
( That's over 4.3 miles in length carrying 109,938 short tons for any readers from Liberia, or Myanmar )
Tech-wise Australia also operates the world's first (and still only?) fully autonomous rail heavy haul routes.