The Seto Ohashi Bridge: Crossing to Shikoku by Train

Somewhere over the Seto Inland Sea, a train slips between the hills and finds itself walking on water, carried island to island on a chain of towering bridges. This is the Seto Ohashi, the fixed link carrying a motorway above and a railway below between Honshu and Shikoku. The crossing takes about twenty minutes, needs no special ticket, and is covered by the Japan Rail Pass. What follows is the engineering story behind the bridge, and a practical guide to riding across it.

Special update: You can now buy single rail tickets for Japan’s Golden Route on JRPass.com - single fares, one-way, fully digital, including the Shinkansen 'bullet' train. 

Quick Answer — What Is the Seto Ohashi Bridge?

The Seto Ohashi Bridge, also known as the Great Seto Bridge, is a chain of six connected double-deck bridges carrying a motorway above and a railway below, spanning roughly 13 kilometres between Okayama Prefecture on Honshu and Kagawa Prefecture on Shikoku. It opened in 1988 and is generally regarded as one of the longest two-tier bridge systems anywhere. Trains, principally the Marine Liner and various limited expresses, cross on the lower deck, and the journey is covered by the Japan Rail Pass, turning an otherwise unremarkable transfer into one of the more memorable rides in the country.

The Engineering Feat

The Seto Ohashi is one of the longest railway bridges in Japan and among the longest two-tier bridge systems in the world, stringing together six named bridges and viaducts across five small islands in the Seto Inland Sea. A road deck runs above, and a pair of railway tracks run below. Key facts worth knowing:

• Length: Roughly 13 kilometres in total, though exact figures vary slightly between sources and are best checked against the operator's own specifications rather than rounded travel-blog figures.
• Opened: 1988, after around a decade of construction.
• Engineering mix: Suspension, cable-stayed, and truss sections, chosen span by span for the distance being crossed.
• Route: Okayama Prefecture on Honshu to Kagawa Prefecture on Shikoku, hopping across five small islands.

It remains maintained by the Honshu-Shikoku Bridge Expressway Company, whose own data is the most reliable source for precise measurements. This crossing is just one piece of a much larger web of Shinkansen and limited express connections across Japan.

Why It Was Built

The Seto Ohashi was built to replace the ferries that once connected Honshu and Shikoku. That dependence carried real risk for decades. The danger was compounded by a string of maritime accidents in the Seto Inland Sea through the 1950s. The worst was the 1955 Shiun Maru disaster, which killed 168 people, including around 100 schoolchildren, when two ferries collided in thick fog. 

That disaster pushed the government to commit to a fixed link rather than keep relying on ferries in a busy, fog-prone stretch of water. Planning took years. Construction ran from the late 1970s into 1988, and the result gave Shikoku a direct rail and road connection to the rest of the country.

Riding Across Today

Travellers cross the Seto Ohashi today by rail on regular services between Okayama and Shikoku, all covered by the Japan Rail Pass. The main options are:

• Marine Liner: The rapid service between Okayama and Takamatsu, running roughly twice an hour, as JR Shikoku confirms on its timetable and fare pages. 
• JR Shikoku limited expresses: Several services continue further into the island beyond Takamatsu, using the same crossing.

Both are included in standard Japan Rail Pass coverage, with only a small optional reservation fee — around ¥840 for a reserved seat or ¥1,010–1,260 for the Green Car. It's worth checking how the regional passes compare if you're planning a wider Shikoku itinerary.

Coming off the Sanyo Shinkansen, the transfer at Okayama Station is straightforward enough for most travellers to manage on their own. First-time visitors who'd rather have help from the moment they land can arrange a Meet and Greet service at the airport instead. It's also worth sorting out a pocket wifi connection before boarding, since signal can dip briefly over open water. Once the train climbs onto the bridge past Kojima Station, the Inland Sea opens out on both sides, with small islands, fishing boats, and the road deck visible just above. 

Best Seats for the Crossing

The best view goes to passengers in the upper deck Green Car of the Marine Liner, where the elevated seating clears the window sills that partly block the lower deck's outlook. A few pointers for the best of the crossing:

• Seat class: The upper deck Green Car gives the clearest, highest vantage point over the water.
• Which side: The left-hand side heading towards Takamatsu, or the right-hand side heading back towards Okayama, since it faces open water rather than the road structure.
• On a budget: Unreserved seats are perfectly serviceable and cheaper, and finding a window seat early on the Okayama platform works well enough.

The Bridge and the Sunrise Seto

The Seto Ohashi is not only a daytime crossing. The Sunrise Seto, one of Japan's last remaining overnight sleeper services, also crosses the bridge in the small hours on its route between Tokyo and Takamatsu, coupled for part of the journey with its sister train, the Sunrise Izumo. 

Passengers dozing through the night rarely see much of the bridge, but the route makes the crossing one of the country's more atmospheric journeys. Pairing a daytime Marine Liner crossing with an overnight return on the Sunrise Seto lets you experience the bridge twice, in two very different lights.

Gateway to Shikoku by Rail

Once across the bridge, travellers can continue into Shikoku's quieter rail network. Coastal branch lines and scenic sightseeing trains open up from here. A few places worth knowing about for the onward journey:

• Shimonada Station: On the JR Yosan Line in Ehime Prefecture. It's often described as one of the closest stations to the sea in Japan.
• Iyonada Monogatari: A sightseeing train that winds along the Iyo coast, passing close by Shimonada itself. Its lounge carriages are built for slow travel rather than speed. 

From here, onward planning depends on where you're headed. Takamatsu, Matsuyama, and the rest of Shikoku each have their own character worth reading up on. Seto Ohashi Memorial Park and the other sights clustered around the bridge round out a stop here nicely. It's also worth sorting out where you'll actually be staying in Shikoku once you know how far you're travelling. 

FAQs

Find quick answers to the questions people ask most about the bridge.

Q: How do trains reach Shikoku?
A: They cross the Seto Ohashi, a chain of double-deck bridges over the Seto Inland Sea carrying trains on the lower deck, typically via the Marine Liner or a limited express from Okayama.

Q: Is the crossing covered by the Japan Rail Pass?
A: Yes, the Marine Liner and the limited expresses that cross between Okayama and Shikoku are included in standard Japan Rail Pass coverage.

Q: How long is the Seto Ohashi Bridge?
A: It measures roughly 13 kilometres and is generally considered one of the world's longest two-tier bridge systems, though an exact figure should be checked against official specifications.

Q: What is the Seto Ohashi Bridge?
A: Also called the Great Seto Bridge, it is a chain of connected double-deck bridges carrying a motorway above and a railway below, linking Honshu and Shikoku across the Seto Inland Sea.

Q: Can you cross the Seto Ohashi by train?
A: Yes, the railway runs on the lower deck beneath the road, and the Marine Liner and limited express services cross it several times an hour.

Q: Which trains cross the Seto Ohashi Bridge?
A: The Marine Liner rapid service and several JR Shikoku limited expresses use the bridge, along with the overnight Sunrise Seto sleeper.

Q: Where is the best seat to see the Seto Ohashi Bridge?
A: The upper deck Green Car seats on the Marine Liner give the clearest view, especially on the side facing open water rather than the road structure.

Q: How long does it take to cross the Seto Ohashi Bridge by train?
A: The crossing itself takes around twenty minutes, with the full Okayama to Takamatsu journey taking roughly an hour.

Q: Why was the Seto Ohashi Bridge built?
A: It replaced ferry crossings between Honshu and Shikoku after a series of maritime accidents in the Seto Inland Sea made a fixed link seem essential.

Q: Does the Sunrise Seto sleeper train cross the Seto Ohashi Bridge?
A: Yes, the Sunrise Seto crosses the bridge overnight on its route between Tokyo and Takamatsu.