The Wuppertaler Schwebebahn (English: Wuppertal Suspension Railway) is a suspension railway in Wuppertal, Germany. The line was originally called the German: Einschienige Hängebahn System Eugen Langen (English: Eugen Langen Monorail Overhead Conveyor System) named for its inventor, Eugen Langen. It is the oldest electric elevated railway with hanging cars in the world and is a unique system in Germany.
https://www.cnn.com/travel/article/wuppertal-schwebebahn-suspension-railway-germany/index.html
No, the scaffolding the train is hanging from is not able to support a train on top. There’s narrow footways on top of it for maintenance but nothing particularly suited for any transport.
Wuppertal is a city stretched along a very narrow and long valley with a small river running along the center. The valley is very tightly populated, the roads along the valley are few and very congested. Faced with tough traffic problems they built this suspension train over the length of the river hovering high above ground level and therefore avoiding all traffic.
Clever solution.