Alessandria–Novara–Arona railway
The management of the infrastructure is the responsibility of RFI SpA , a subsidiary of Ferrovie dello Stato , which classifies the line as complementary . 
<triplet> RFI SpA <subj> Ferrovie dello Stato <obj> parent organization <triplet> Ferrovie dello Stato <subj> RFI SpA <obj> subsidiary