TEETHING TROUBLES. Where Worlds Collide reports on performance problems with the Virgin Trains Voyager units and the Pendolino trains. Closer to home, the Acela Express trains were delivered with construction errors, and require suspension tests. Hasn't anybody learned the lesson of the Metroliner project, years ago? You don't build 50 prototypes, and hope they work. Oh, that was the P5 project, nearly 70 years ago?