Before 1997 Arosa Line was electrified with 24 000 V DC (today it's 11 kV 16.7 Hz AC) The route was operated with electric motor cars type ABDe 4/4 und ABe 4/4 https://commons.wikimedia.org/wiki/File:RhB_482_Arosabahn.jpg#/media/Datei:RhB_482_Arosabahn.jpg Here i found a video from 1990 showing how the route was before 1997 on a trip from Chur to Arosa: Coira - Arosa im Führerstand - YouTube Quite a diiference of todays route.
The distant scenery in that video is terrible On a more serious note.... Thanks for posting it was really interesting. Loved the goat on the bridge.
