In Indonesian a regular train is Kereta Api, literally fire wagon. High speed train is Kereta Cepat. Now you have a high speed wagon. English has some of these traditional Iron Horse types of phrases too.
https://abcnews.go.com/Travel/wireStory/indonesia-gears-start-high-speed-rail-line-91433113
I have ridden the old line. Slow, but very scenic.