The One about Sapporo’s subway being the only subway that uses rubber tires

The One about Sapporo’s subway being the only subway that uses rubber tires

Image Source: Wikipedia / Photo by: 出々 吾壱

On April 22nd, a tire on a Sapporo Municipal Subway Namboku Line train punctured, causing a full-day suspension of service between Kita 24-jo Station and Aso Station. Sapporo’s subway is the only one in Japan that uses rubber tires. What is the reason for this? We will explore this from the history of the subway.