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The distinction between light rail and streetcars gets confusing - is the San Diego Trolley a "street car" when it runs down the street? Or because cars aren't supposed to drive in its "lane" is it still light rail?

What about when Amtrak comes rolling down the street? https://www.youtube.com/watch?v=EFk-yeGHn-o

I've always taken them to be "single car trains that run in normal lanes" but that almost covers the electric busses of Seattle.

Here they are nowhere on the "street" - at least nowhere that I can see. They are on separate rail likes - like a train.

The T runs mostly on a separate rail, but there are a number of places in city limits where it runs with cars on the street. Check out Arlington Avenue in Allentown (the Pittsburgh neighborhood, not the city).

I see no T routes down Arlington

Converted to light rail in the mid 80s