The train appears a second time: Olmo is also on this train. He’s going to participate in the strikes. Probably to those of the Red Week.
The train, already symbol of progress, is decorated with red flags. The colors of communism. With this image, Bertolucci suggests a further metaphor: communism is progress!
1) train is progress
2) train is communism
3) communism is progress
This time Alfredo challenges the train .. he does not run away … proving to be determined to face and fight the danger of a socialist revolution