OK I am going full-on pedantic here. The article says that these trolley buses (which are buses that run on wheels, not rails, while collecting electricity from an overhead wire) can run 15 miles off wire – making the whole trolley problem moot. Don’t want to participate in this philosophical debate? Just turn the steering wheel!
But, I did look up how much Kansas City’s new-ish streetcars cost, and was shocked(!) to learn that they are more than $4 million each! (This is comparable to Portland, Tucson, and Cincinnati.)