The advent of the steam age ushered in a great social revolution, but as Maciej Drygas’s film points out, the technology also took us off the rails The advent of the steam age ushered in a great social revolution, but as Maciej Drygas’s film points out, the technology also took us off the rails L ike Koyaanisqatsi with an Interrail pass, this often-fascinating documentary – constructed entirely of archival footage, with no voiceover – surveys the sweeping 20th-century changes ushered in by