 Julien BocherNarrator (voice) | Narrator (voice) |
| JJérémie ZeguermanSelf - Director , gare du Nord | Self - Director , gare du Nord |
| PPatrick CognassonSelf - Historian, railway specialist | Self - Historian, railway specialist |
 Clive LammingSelf - Railway historian | Self - Railway historian |
| ÉÉtienne TricaudSelf - Architect and engineer, co-founder and president of AREP | Self - Architect and engineer, co-founder and president of AREP |
| JJean-Marie DuthilleulSelf - Architect and engineer, co-founder and president of AREP | Self - Architect and engineer, co-founder and president of AREP |
| SSylvain GuillonSelf - Substation regulator, gare du Nord | Self - Substation regulator, gare du Nord |
 Noël MamèreSelf (archive footage) | Self (archive footage) |
| FFlorian ArtusSelf - Switchman-greaser, gare du Nord | Self - Switchman-greaser, gare du Nord |
 François MitterrandSelf (archive footage) | Self (archive footage) |
 Elizabeth II of the United KingdomSelf (archive footage) | Self (archive footage) |
| DDavid TrendelSelf - Substation regulator, gare du Nord | Self - Substation regulator, gare du Nord |
| SStéphane FeliciSelf - Local manager, gare du Nord | Self - Local manager, gare du Nord |
| LLaurent FournierSelf - Station service operational manager, gare du Nord | Self - Station service operational manager, gare du Nord |
| XXavier NowakSelf - Station manager, gare du Nord | Self - Station manager, gare du Nord |
| PPatrick RopertSelf - Director general, SCNF Gares & Connexions | Self - Director general, SCNF Gares & Connexions |
| PPatrick MignotSelf - Paris-Nord project director, SNCF Gares & Connexions | Self - Paris-Nord project director, SNCF Gares & Connexions |
 Jean-Michel WilmotteSelf - Architect, Wilmotte & Associés | Self - Architect, Wilmotte & Associés |
| FFrédéric LagoutteSelf - Operations manager, AMRA | Self - Operations manager, AMRA |
| LLudovic LunettaSelf - Site manager, AMRA | Self - Site manager, AMRA |
