The 3Txx are always commissioning trips. There are regular workings into the bays.
Going off what I actually, no. But then I'm seeing actual reasons not the guess work that happens on this forum. And this forum is not entitled to know the workings of every incident. I don't the same people will be demanding the same of every other train nor the ones soon to be introduced. And I'm sure will be now used to attack me as being anti passengers/forum users.
Fine. Trying to make sense of your rather garbled message, I perceive that criticism of the poor performance of the 700s is an irritant. So, here is another stance from a passenger's viewpoint - I don't care about the nuances of every failure - I care that my train service is repeatedly and badly disrupted by the failures of new and supposedly well-tested trains.