Why are trains so packed with luggage?

The number of trains loaded with luggage in Japan has more than doubled in the past decade, and Japan’s transport minister says it’s due to the country’s booming economy.

“The railways have more than tripled in size since 2007, and there’s no end to the luggage that is being transported,” Shigeru Miyamoto said Tuesday at a briefing with reporters.

“There are more than a billion passenger trains coming into Japan every year, and the amount of luggage is increasing in volume.”

The country’s rapid growth in its economy has also led to the construction of more than 50 million rail cars, which Miyamoto estimated are currently being built.

He said the amount has more then doubled over the past five years, and it’s expected to triple again within the next 10 years.

Miyamoto said the rail industry has been facing a shortage of new rail cars because the number of rail lines needed to be upgraded has grown by more than 5,000 km (2,000 miles) per year since 2013.

The increase in the number, or total number of cars, has driven up the cost of rail cars by more then $7 billion in the last five years alone.

The cost of new trains is also rising due to inflation and other factors.

That includes higher fuel prices, which the government is trying to alleviate with an increase in passenger fees.

But as the cost rises, more and more passengers are opting to take trains over the subway, which is also faster and cheaper.