Yes. The official/technical abbreviation is apparently NW because German Bundesland abbreviations are two letters, but colloquially (and even formally on most occasions) everyone calls it NRW.

Incidentally when GP said the police "use" the guns at train stations, what they meant was "carry". The German "einsetzen" is more ambiguous about whether something is part of the loadout or actively used (I guess "deploy" is the closest equivalent). I'm fairly certain the guns aren't actually loaded (they're just too big to holster) but at times the Bundespolizei (the federal police responsible for train stations and ports of travel) will indeed carry H&K machine pistols.