(NYTimes) - The mysterious train that pulled into Beijing’s central train station on Monday night is now known to have been carrying Kim Jong-un, North Korea’s leader, who arrived in the capital for secret talks with his Chinese counterpart.

The train spotted in Beijing — 21 cars painted drab green, their windows tinted to obscure the identities of those on board — bore the hallmarks of the bulletproof private transports preferred by the mistrustful leaders of North Korea.

Both Mr. Kim’s father and grandfather, the country’s former leaders, traveled in similar style on rare foreign trips, stoking decades of intrigue and interest about the trains.