外房線
Isumi is approximately 1 hour and 10 minutes from Tokyo Station by limited express train via Ōhara Station on the JR East Sotobō Line. Ōhara Station is also the connecting point for the JR East Sotobō Line and the Isumi Railway Company Isumi Line, which connects the Pacific Coast of east Chiba Prefecture to the interior areas of the Bōsō Peninsula.