Here's everything we know about the mysterious armored train that just took a secret guest from North Korea to Beijing

The green and yellow paint scheme is similar to that on trains used by Kim Jong Il and his father Kim Il Sung.

Those trains are reportedly armored and equipped with communications technology and reception halls.

Source: The Guardian

The leaders of North Korea rarely use airplanes for travel, opting for luxury trains instead. Kim Il Sung once traveled from North Korea to East Germany using only his train.

Once the train pulled into Beijing, it was met with heavy security.

A limousine without any license plates was waiting for the high ranking official, initially believed to be Kim Jong Un.

Armored vehicles, like the one in the background, were even present, further convincing analysts that someone important was visiting.

A motorcade of Chinese policemen on motorcycles escorted the mysterious vehicle along with others in a convoy in a similar fashion to state visits.

The convoy looked similar to that President Trump had when he visited Beijing.

Here's a video of the convoy driving through Beijing.

DPRK's leader #KimJongUn visits Beijing on 26th March pic.twitter.com/UhSgpTeK0L

— gongjiejames (@jamesgongchina) March 26, 2018

The streets were lined with security personnel, especially on Tuesday, when the mysterious delegation left Beijing.

The Diaoyutai State Guesthouse, where foreign dignitaries and provincial government officials stay during official visits, had an unusually large security presence.

The security included officers dressed in tactical gear.

As well as plainclothes security around the compound.

On Tuesday morning, the same convoy was used to take what is now being referred to as a "North Korean delegation" back to the train station.