PZB doesn't work on the BR. 146. On the DoSto Controllcar it only works if there is a singal to acknowledge. Normally it should all the time.
I have the same problem...when you hit the B button on Xbox, it does not acknowledge PZB or Sifa. So nothing happens. You would have to flick the button in the cab by using the control stick, but this takes too much time while driving. This happens on the new BR143, the new DoSto Controllcar for Dresden and as well on the BR 146.2. It not only happens on Riesa-Dresden, but also when you select the new BR143 on MSB for example, the B button still does not acknowledge SIFA or PZB.
i have the same problem on XBOX Series X. The issues that Mr.Drew posts, i had it on MSB with the 143, too.