A total of 25 Class EF63 locomotives were built between 1962 and 1976 exclusively for use as bankers on the steeply-graded Usui Pass section of the Shinetsu Main Line between Yokokawa and Karuizawa.
The new locomotives were the JNR Class EF63 banking engines used for help in both ascending and descending the 66.7‰ (1 in 15) gradient line.
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