Trains are timed, so in addition to all the meanings of cars, they can also symbolize time. Times or timing.

Of course, sometimes the meaning of a train is more straightforward. 'Someone dreamed that he was on a train, which turned into a ship. He was with his mother and discussing problems with the American behavioral psychologist Skinner...'

The dream is long and has many analytical contents, but the meaning of the train and ship is not very complicated.

Dreamer is a Sichuanese. He needs to take a boat and a train on his way from his mother to Beijing-so the train and boat represent 'leaving his mother.'