Photo/IllutrationJapan’s oldest monorail, a rare suspended-type system running inside Tokyo’s Ueno Zoo, will be suspended from November. (Provided by the Tokyo metropolitan government)

After more than 60 years, the popular monorail inside Tokyo's Ueno Zoo is facing extinction due to aging and the huge expense needed for its continued operation.

Japan’s oldest monorail, which runs only 331 meters between two stations inside the zoo in Taito Ward, will suspend operation in November, the Tokyo metropolitan government announced Jan. 23.

The metropolitan government will consider whether to resume operation or shift to another means of transportation.

It requires about 1.8 billion yen ($16.4 million) to replace its two cars, which would take about three years.

The suspended-type monorail is the country's only one that hangs from the rail with arms only on one side.

The monorail line, the shortest in Japan, has connected the East Park and West Park in a ride lasting about one minute and 30 seconds since December 1957.

The monorail, with a capacity of 62 passengers, carries about 1 million passengers annually.

The current monorail, the fourth-generation model, started its service in fiscal 2001.