that doesn't speak to the severity of the consequences of the collision.

So speak to it instead of posting disingenuous hypotheticals. For instance in San Francisco it's not that hard to find examples of Muni or Caltrain colliding with other vehicles.

Here's a vintage streetcar colliding with a semi. Three injuries. None life threatening. One treated at the scene (so presumably more minor).

https://www.ktvu.com/news/san-francisco-muni-f-street-car-an...

Here's a bus vs streetcar. No apparent injuries and the bus wasn't even taken out of service.

https://sfist.com/2012/10/10/muni_bus_hits_f-line_streetcar_...

Here was a terrible accident. Tram vs bus. Fifteen people injured. As the SFFD chief put it nobody was seriously injured.

https://www.sfgate.com/bayarea/article/Muni-bus-trolley-coll...

Surely a car vs a tram or bus would be worse, right?

https://www.sfgate.com/bayarea/article/Muni-L-service-disrup...

No reported injuries from the Muni passengers.

Headline reads: Muni collision sends 1 to hospital. Body reads: No one on the Muni train was hurt, Rose said.

https://www.sfexaminer.com/news/muni-collision-sends-1-to-ho...

Muni bus hits car making an illegal turn. No serious injuries.

https://www.cbsnews.com/sanfrancisco/news/muni-bus-slams-int...