A five-year-old slipped away from his mom, boarded a train and rode through 34 stations before transit workers found him.

The Bronx boy got on a downtown No. 1 train at the Marble Hill subway station shortly before 8 a.m. Monday, riding it 13 miles to South Ferry, the end of the line, where two transit workers found him, the New York Post reported.

The transit workers spotted the boy sitting alone on the empty train, where he was "joyful and playing," conductor Luis Cabarruoy told the New York Post.

Mother and son were reunited a short time later.