The journey from Oshu to Oyama is mainly serviced by the local Yamagata Line and the Akita Shinkansen. The Akita Shinkansen offers a faster option, traveling at speeds of up to 250 km/h (155 mph) and covering the distance in approximately 4 hours, with few stops at major stations. On the other hand, the Yamagata Line operates at lower speeds, averaging around 100 km/h (62 mph), and typically takes about 6 hours for the same route, making several local stops along the way.
Both train options provide comfortable seating arrangements, but for those prioritizing speed, the Akita Shinkansen is preferable, while the Yamagata Line is suited for travelers interested in enjoying scenic views of the countryside. Additionally, the Shinkansen has more onboard facilities such as food and beverage services, while the Yamagata Line may offer basic amenities.