It very much is/was. Three were made and produced almost entirely in Yugoslavia, but it unfortunately had quite a few problems, namely that the diesel engines it used weren't great and were prone to overheating, compounded by the fact it was used on mountainous routes during hot weather, so they would need replacing quite frequently. The aluminium frame and the chassis were also damaged quite easily due to the shaking from the engines, and replacing these was obviously more difficult and costly, so the project was unfortunately ended in the early 70s.
On an even sadder note, all three were scrapped at some point, which is a massive shame because it is an absolutely beautiful train that should absolutely be in a museum right now, both for its aesthetic qualities and for its innovation.
It very much is/was. Three were made and produced almost entirely in Yugoslavia, but it unfortunately had quite a few problems, namely that the diesel engines it used weren't great and were prone to overheating, compounded by the fact it was used on mountainous routes during hot weather, so they would need replacing quite frequently. The aluminium frame and the chassis were also damaged quite easily due to the shaking from the engines, and replacing these was obviously more difficult and costly, so the project was unfortunately ended in the early 70s.
On an even sadder note, all three were scrapped at some point, which is a massive shame because it is an absolutely beautiful train that should absolutely be in a museum right now, both for its aesthetic qualities and for its innovation.
Here's a fairly detailed article about it, albeit in Croatian which is not great for google translate, but you can hopefully get the gist of it, and it also has a bunch of pictures.