The movie demonstrates several examples of parallel and skew lines in space. In the example both rails of a railroad are parallel. They are in the same plane and have no common points.
The telegraph cable and the rail are parallel also. Straight lines in space may have such position that they are neither cross nor parallel. In this case they are called skew lines. The high-voltage cable and the telegraph cable are skew lines. The high-voltage cable and the rail are skew lines also.