How likely are delays in other parts of the project? There are plenty of things that could be delayed and would physically prevent train service from running on

How likely are delays in other parts of the project? There are plenty of things that could be delayed and would physically prevent train service from running on the line. Is it really such a massive risk to to say that safety equipment must be installed before operations begin, even if the train could potentially make the run without it? I don't know about that "quite safe" thing. I looked up the stats in another comment in this tree and they look pretty bad for trains.