 From 1984 to 1986, the 18 eight-car trains were extended to ten cars, the four-car train was extended to eight cars, a new four-car train was formed, and the remaining two driving cars were donated to the train that would become train 1-02.Finally, in 1989, the two eight-car trains and the four-car train were extended to ten cars with second generation cars built then.In the 1990s, the trains received their current numbers.