 Damien BoisseauNarrator (voice) | Narrator (voice) |
| LLaurent CavroisSelf - President of LISEA from 2014 to 2017 | Self - President of LISEA from 2014 to 2017 |
| GGilles GodardSelf - Project director of COSEA from 2014 to 201 | Self - Project director of COSEA from 2014 to 201 |
 Bertrand LemoineSelf - Engineer, architect and historian | Self - Engineer, architect and historian |
| SStéphane CarrerSelf - Construction director of the Dordogne viaduct | Self - Construction director of the Dordogne viaduct |
| RRomain NicolasSelf - Technical director at Dodin Campenon Bernard | Self - Technical director at Dodin Campenon Bernard |
| OOlivier GouinSelf - Industrial director at MESEA | Self - Industrial director at MESEA |
| CChristophe Pélissié du RausasDevelopment director at Vinci | Development director at Vinci |
| NNicolas NotebaertSelf - Managing director of Vinci Concessions | Self - Managing director of Vinci Concessions |
| HHubert BoninSelf - Historian | Self - Historian |
| AAnne-Laure TéchenéSelf - Project director at SNCF Gares & Connexions | Self - Project director at SNCF Gares & Connexions |
| GGérald BassezSelf - Civil engineering expert at MESEA | Self - Civil engineering expert at MESEA |
| CCaroline DemilcampsSelf - Environmental manager at LISEA | Self - Environmental manager at LISEA |
| HHervé Le CaignecSelf - President of LISEA | Self - President of LISEA |
| CChristophe BergerSelf - Project director at SNCF Gares & Connexions | Self - Project director at SNCF Gares & Connexions |
| JJean-Bruno DelrueSelf - President of MESEA | Self - President of MESEA |
| MMathieu CailleteauSelf - Track and catenary maintenance team leader | Self - Track and catenary maintenance team leader |
| DDelphine Rodrigues da SilvaSelf - Assistant track and catenary maintenance team leader | Self - Assistant track and catenary maintenance team leader |
| GGilbert MaurelSelf - Assistant director of the Villognon maintenance base | Self - Assistant director of the Villognon maintenance base |
| NNicolas QuatremèreSelf - Operations Manager at SNCF Réseau | Self - Operations Manager at SNCF Réseau |
| AAlain BaradatSelf - Scheduling, planning, and railway interfaces manager | Self - Scheduling, planning, and railway interfaces manager |
| VValérie Vesque-JeancardSelf - President of Vinci Railways | Self - President of Vinci Railways |
