'Skytrain' they say has already been in use for nearly 30 years.
It's Chiba Urban Monorail, which adopts the similar system.
In addition to it, another type of the monorail has already been opened in Chongqing, China. The monorail trains were manufactured by Japan's HITACHI and China's CRRC Changchun.
Based on its history, CRRC Sifang should have known how to manufacture that type of monorails.
I don't know why CRRC Sifang is stick to development of the conventional monorail system.