I'm under the impression all Vix-ERG designed systems do this as well. Examples are ClipperCard (SF Bay area) and OrcaCard (Seattle). I had heard that the Orc

I'm under the impression all Vix-ERG designed systems do this as well. Examples are ClipperCard (SF Bay area) and OrcaCard (Seattle). I had heard that the OrcaCard system had an issue early on where a number of cards were disabled as a result of a TVM not being synced back to the database. There certainly was a large number of completely dead cards for a couple of weeks in 2010.