[frutiger]

The answer was almost certainly generated by an LLM.

[pibaker]

I tried asking ChatGPT if Japanese high speed rail has level crossings and it correctly identified the line I used as my counterexample (Yamagata Shinkansen). I think GP is just plainly misinformed in a more boring way.

[dchest]

If you paste the comment it replies to into ChatGPT, it generates almost exact same answer as that comment. Also, "Finally, ..." and "it's not A, it's B" is a good tell.