Hello! Do you know why Kumamoto tram survived in 1960-70? As I know there was a global network closure of the tram system, but two lines (now "A" and "B") were saved. What is the reason for it? Can you tell me or give some recomendation where I can read about this? Because Wikipedia and official site of tram operator has very poor information with general descriptions like "automobile lobby", "bus network could be expand cheaper than tram", but there is no information how two lines of Kumamoto tram become operative due to our days and why.