You can't see the train, because as the title says, the camera is at its front, and it's pointing forward. You can see the steel lattices when it passes under a bridge, and when it enters the tunnel, the screen grows black. Finally it pulls into the unnamed station and the landscape stops changing.
The movies have always been fascinated by trains. At first it was because they were the 19th century epitome of motion, and later because of habit. Still, it is startling to see a large part of this movie take place in darkness so absolute the audience can see nothing. It is part of the twin fascination of movies: the trains, and the participation of the audience.