Unions and politicians are blaming each other for the train cancellation. News keep rapidly changing their articles, so it's hard to find out what's going on. Some examples:
https://www.smh.com.au/national/nsw/it-s-going-to-be-a-very-…
https://www.abc.net.au/news/2022-02-21/nsw-train-shutdown-ex…
Who do you think is responsible?
Keyword is "easily" - it's a very substantial capital investment.
It's also yet to be seen what happens when a supplier of all this highly-specialised proprietary equipment folds, or parts of the system become unserviceable or obsolete and unrepairable - do you need to upgrade the entire control system again?