These locomotives are mountaineer, model JR EF63. EF63 climbs usui pass in JR Shinetsu line, it's inclination is 33 0/00. Currently, usui pass was disused and alternated by Nagano shinkansen.
JR, Model: EF63
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Type1: EF631 Type2: EF632 to EF6325
Manufactured: 1962-1976
Purpose: Supplement for acclivity
Drive: B-B-B
Current: DC 1500V
Output: 2550kW
Gross weight: 108.00 m.t .(measurement ton)