there it is. Parliamentary Group for Fighting with Transport Divide, talking about "uncertainties around the problems with Impuls vehicles".
https://sejm.gov.pl/Sejm10.nsf/transmisje.xsp?unid=BA6B02C9CB6ABA06C1258A94004154B4#
text coverage in english with happen here, below this post
there's Dragon Sector, Newag, PKP Intercity, Koleje Mazowieckie, Polregio (which typically refused comment!), SPS Mieczkowski