There was an experiment in Australia back in the mid 1990s using these carriages and towing them with conventional diesels, I think between Sydney and Canberra.
@Kempy72 China uses many different high-speed trains, they have imported technology from different countries. According to Wikipedia one X2000 trainset was used in China for some time, but later was taken back to Sweden: https://en.wikipedia.org/wiki/X_2000