Now that's a different idea, a high-rail ambulance, but makes perfect sense!
And of course the subject of the trolley and interurban line funeral cars have been discussed before, at least on the old message board if not on this one.
But now Milwaukee had something that I think may very well be unique, or at least I've never heard of another one. Milwaukee had a streetcar ambulance, which they called a hospital car. And fortunately, it still exists, and a museum currently has it under restoration. Although the car had three very different uses and configurations during its service life, with only one of them being as a hospital car, and I do not know in which version the museum is restoring it as.