https://en.wikipedia.org/wiki/US_Standard_Light_Rail_Vehicle
Thanks for the link but this is pretty well known stuff.
The SLRV may be a collection of bad business decisions and poor design, but I hardly classify it as a disaster. I would consider it to be a poorly executed attempt to replicate the standardization of the PCC.
The PCC have outlasted the Boings…The Mattapan Line and up untill a few years back the Drake line in pittsburgh
They did provice the service between the PCC era and the current equipment in both San Francisco and Boston.
I understand that those clunkers had over 1,000 pieces in the mechanism to open the doors. Aircraft thinking, I guess.