testing of prototypes commenced in december 1993, and the roll-out of the system was carried out from august 1996 to april 1998, and acceptance occurred in november 1997. public field trials were carried out on buses from august 20 1996, and on rail services from september 18 1996. the system commenced full revenue service from may 1998 at a cost of $330 million. contractual issues between onelink and the victorian government were not settled until may 2002 with the payment of up to $65 million in a staged settlement.