For Kim Jong-Un to leave North Korea, it takes a personal toilet, private airstrips, and bulletproof trains that go only 37 miles an hour

Most world leaders travel by airplane, but much like his father and grandfather, Kim Jong-Un's preferred mode of transportation is private train.

Whenever Kim travels, as he did to China last month, three trains are needed: an advance security train, Kim's train, and another train for bodyguards and supplies, according to The New York Times.

Each carriage on Kim's 90 high-security carriages is bulletproof, and with all the extra weight, the trains top out at just 37 miles per hour, the Times reported.

Apparently, Kim Jong-un doesn't use public restrooms when he travels, instead opting for a "personal toilet," Lee Yun-keol, a former member of the North Korean Guard Command unit, told The Washington Post. And the reason has nothing to do with cleanliness.

"Rather than using a public restroom, the leader of North Korea has a personal toilet that follows him around when he travels," Lee told The Post. "The leader’s excretions contain information about his health status so they can’t be left behind."

In 2015, South Korean news agency DailyNK reported that a customized bathroom is built into one of the cars of Kim's convoy of armored vehicles.

Kim's meticulously planned meeting with South Korean president Moon Jae-In accounted for the personal tastes of both leaders.

For Kim, that meant bringing a special noodle machine to make "naengmyeon," a dish of cold buckwheat noodles. According to Vice News, the meal was prepared by the head chef at Okryu-gwan, a famous restaurant in Pyongyang.

Kim's meeting with Chinese President Xi Jinping in March was notable for a few reasons. For one, it was Kim's first-ever international trip since assuming power in 2011.

But the visit was also noteworthy for the mystery surrounding it. Kim's visit wasn't made public until it was already over, confirming for intrigued observers that the armored train that arrived in Beijing was indeed carrying the North Korean leader.

Kim is known for his penchant for his extravagant tastes, and that applies for state travel as well. The leader reportedly ordered the construction of five private airstrips for his personal use, according to The Telegraph.

The airstrips are located next to Kim's multiple palaces and private train stations, The Telegraph reported.