You see?!! They put them back in service, making people think that they're ok. The minute something goes wrong, they'll yanked them off again! This is just a damn tease!! They need to test them to make sure.
I suggest they test them for no less than 40 years before placing them into revenue service, to ensure they really are as durable as we need them to be. (End Sarcasm.)
Seriously, it's not a tease, it's not a trick, it's not a conspiracy. It's a procurement. No one, literally no one, tests new vehicles in non-revenue service indefinitely, until every possible theoretical problem under the sun can be assessed for. Not the T, not the MTA, not Amtrak, and not even the people who make airplanes (and when those go wrong unexpectedly, it tends to be far more catastrophic than a subway car).
The first CRRC cars arrived on-property in December 2017, more than a year and a half of
only testing before they first ran in revenue service in August 2019. They did test them, tested them for a year and half before they entered service, and it's not like they stopped collecting data on them once they were in revenue service. The actual, identified, specific physical problem that got them pulled this year was the side bearer pads wearing out faster than expected, something they would in all likelihood have
no reason to suspect until something
actually went wrong and, when it did, it was on an ancient, little-used switch that was already scheduled for replacement because of how old it was.
No transit operator in their right mind would
ever decide that they are going to conduct an unlimited open-ended non-revenue testing period for new equipment just to see if anything crops up with them ever. If you're saying the cars need more testing, it obviously took years for the side bearer pads on these cars to wear down to the point where they contributed to the derailments. Would you prefer that they had gotten no revenue service at all, based on the
possibility that something, someday might eventually go wrong? That seems to be the logical conclusion of what you're arguing, and I have a hard time thinking it'd be a popular one among the transit riders and taxpayers of Massachusetts.
EDIT: I apologize for the distinctly ranting tone of this post, but it's endlessly frustrating how often we seem to have this same conversation in this thread. I understand how frustrating it is to have the cars repeatedly pulled from service (the implications of my username notwithstanding, I'm primarily an Orange Line rider), but the level of hysteria (moreso in the comments on the Boston Globe or, worse, Facebook, but also at times in this thread) for a perfectly normal if not perfectly-smooth procurement is absolutely unwarranted, and trying to make that point sink in, repeatedly, gets a little exhausting, hence the ranting. Rant complete, we return you to our regularly-scheduled CRRC-cars programming already in progress.