Goons In The Train

Every passenger on the train is ready to sleep. Four goons in the train signaled to each other. 

One by one light is put off. One of the four goons took a knife out. The train is approaching the tunnel route. Everything became darker on the train.

Fear, sleep & crime all are playing their music.

Someone started screaming in the darkness. Every other person on the train moving with fear.

The train got stopped after going through the tunnel and lights were put on.

The railway guard checked the train. Four goons were missing from it. No one knows they were goons until the train reached the next station.

In the next station, there are wanted posters with pictures of the goons. No material was stolen from the train. 

What happened in the tunnel becmysteryeryy that no one has solved.

Train lights were never kept off on that route again.