Task: Question Generation
Input (English): Context : Servicing of Adtranz products NSB Class 73 and GMB Class 71 built at former Adtranz factory in Strømmen (see Strømmens Værksted), also manufactures NSB Class 93 Poland: (Bombardier Transportation Polska), includes manufacturing site in Wrocław (former Pafawag factory), Katowice, Łódź and Warsaw. 
Subject : Bombardier Transportation 
Relation : parent company
Output (English): What is Bombardier Transportation's parent company?