The Hakone-Tozan Line (箱根登山鉄道線, lit. Hakone Mountain-Climbing Railroad Line) is Japan's first mountain railroad.

The initial stretch of the line from Odawara to Hakone-Yumoto started operations in 1919, with current terminus Gora reached in 1930. Some trains on the Odakyu Odawara Line run through on the line up to Hakone-Yumoto . From Gora, visitors can continue up the mountain on the Hakone-Tozan Cable Car .

The railroad is capable of climbing one meter vertically for every 12.5 meters of horizontal distance, a maximum slope of 8%. The line traverses through the Fuji-Hakone-Izu National Park, so the line was carefully designed to limit the impact on scenery. Due to the difficult conditions, the line has several switchbacks used to ascend particularly tight spots.

Stations

• Gora
  
• Chokoku no mori, which takes its name from the outdoor sculpture museum
• Kowakien
  
• Miyanoshita
  
• Ohiradai
  
• Tonosawa
  
• Hakone-Yumoto
  
• Iryuda
  
• Kazamatsuri
  
• Hakone-Itabashi
  
• Odawara