MÁV
The BHÉV lines were constructed as branch lines of the Hungarian State Railways. "Helyiérdekű vasút (HÉV)", literally "railway of local interest", is a general term in Hungarian traffic. Therefore, like internationally with the term "metro", the stations are only marked with "H" or "HÉV", though this is not the full name of the system. The five BHÉV lines are operated by the public transport company MÁV-HÉV Zrt., a subsidiary of Hungarian State Railways. Inside Budapest, standard BKK tickets and passes are valid on the BHÉV. Outside Budapest, a separate ticket must be purchased.