alt Hacker NewsRight, so, mathing it out, the US has a population of around 340 million but Spain has a population of around 49 million. 340/49 is roughly 7, so the per capita equivalent in the US would be a single incident killing 21*7=147 people. So that'd be one incident killing 1.5x the average number of people usually killed across the rest of the country combined.
Like I said, a pretty bad day.
A completely unremarkable day, more like it. Given stochasticity there's bound to be at least a dozen days per year with 50% more than the average, especially since car deaths depend a lot on weekday, holidays, weather and so on - much moreso than train deaths. No one would look up from it, wouldn't make the news.