Are there any examples of complex, large-scale government IT projects that have succeeded, come in on cost and time and worked better than what they replaced?

Are there any examples of complex, large-scale government IT projects that have succeeded, come in on cost and time and worked better than what they replaced? I can only think of one example: the UK's Government Digital Service (who built www.gov.uk). Admittedly not a mission-critical project that saves lives, but they actually managed to bring the hundreds of different government websites under one site, re-wrote and re-rorganised the content so it was easier to find and read, and actually improved considerably on what was in place before. It's an exception rather than the rule though to most government or local council projects in the UK. Any other examples of success? (There must be some)