Michigan Central Railway Tunnel: The Engineering Marvel Beneath the Detroit River
Discover the remarkable story of the Michigan Central Railway Tunnel, an engineering achievement hidden beneath the Detroit River for more than a century.
Built between 1906 and 1910, this underwater railroad crossing connects Detroit, Michigan, and Windsor, Ontario. Instead of digging beneath the river, engineers floated enormous steel tunnel sections into position and carefully lowered them into a trench in the riverbed.
This Detroit River Live historical documentary combines authentic Library of Congress photographs with original footage of today's Detroit River waterfront to explore how the tunnel was constructed, why it replaced railroad ferries, and how it continues serving freight trains more than 115 years later.
The History of the Michigan Central Railway Tunnel
Hidden beneath the Detroit River, just east of the Ambassador Bridge, is one of the region's most remarkable engineering achievements: the Michigan Central Railway Tunnel.
Completed in 1910, this underwater railroad crossing connects Detroit, Michigan, with Windsor, Ontario. Although thousands of people travel along the Detroit waterfront every day, relatively few realize that freight trains continue to pass through a tunnel beneath the river.
Even more remarkable is how the tunnel was built.
Before the Tunnel: Railroad Ferries on the Detroit River
At the beginning of the 20th century, the Detroit River was already one of North America's busiest transportation corridors. Freighters, passenger vessels, and railroad ferries shared the waterway between Michigan and Ontario.
But getting railroad cars across the international border was a complicated operation.
Railcars had to be transferred onto specially designed ferries, transported across the river, and moved back onto railroad tracks on the opposite shore.
According to an engineering article published in Scientific American on December 21, 1907, handling through-freight shipments could take four to seven hours.
Winter created additional problems. Heavy ice sometimes trapped ferries or interrupted crossings, creating delays that affected railroad operations throughout the region.
The Michigan Central Railroad needed a faster, more dependable way to cross the river.
An Extraordinary Engineering Solution
Construction began in 1906 under the Detroit River Tunnel Company.
Instead of excavating the entire crossing deep beneath the riverbed, engineers selected an innovative approach known as immersed-tube construction.
Workers first dredged a trench along the planned underwater crossing.
According to the detailed engineering account published in 1907, enormous steel tunnel sections were fabricated at a shipyard in St. Clair, Michigan. Each section was approximately 260 feet long and 23 feet in diameter.
The sections were temporarily sealed so they could float. Tugboats then transported them down the river to the construction site.
Once a section was positioned above the trench, engineers carefully admitted water into its flotation system, gradually lowering the massive structure toward the riverbed.
The operation demanded extraordinary precision. Crews had to contend with the Detroit River's current while keeping each section properly aligned with the sections already in place.
Divers worked underwater to connect the sections and seal their joints. Once the connections were watertight, crews pumped out the water and installed the concrete lining that formed the finished railroad passage.
The underwater sections were then connected to railroad approaches extending inland on both sides of the international border.
The Detroit Historical Society identifies the project as the first immersed-tube tunnel to carry traffic.
Opening a New International Railroad Crossing
The Michigan Central Railway Tunnel opened on July 26, 1910, after nearly four years of construction.
The completed crossing measured approximately 1⅜ miles from portal to portal and cost approximately $8.5 million.
Electric locomotives originally hauled trains through the tunnel, eliminating the need to transfer those trains across the river by ferry.
The improvement was significant. Instead of relying on time-consuming ferry operations vulnerable to ice and other river conditions, railroads could move trains directly between the United States and Canada.
The tunnel became an important part of Detroit and Windsor's transportation infrastructure, supporting the movement of freight and passengers across the international border.
More Than a Century of Service
The Michigan Central Railway Tunnel remained important long after its original construction.
In the early 1990s, one of its two bores underwent improvements to accommodate larger railroad equipment.
Today, the tunnel continues serving international freight traffic, a remarkable achievement for infrastructure that opened more than 115 years ago.
Unlike the better-known Detroit–Windsor automobile tunnel, the Michigan Central Railway Tunnel is not open to the general public. Much of its history remains hidden from the people traveling along the river above.
The next time you're boating along the Detroit waterfront or approaching the Ambassador Bridge, consider the engineering achievement nearby.
Beneath the waters of the Detroit River lies a railroad crossing built more than a century ago—one that helped transform transportation between Detroit and Windsor and continues to serve the region today.
Historical Sources & References
Detroit Historical Society
The Detroit River Tunnel Few Have Seen: The Michigan Central Railway Tunnel
Scientific American — December 21, 1907
The Detroit River Tunnel by James Cooke Mills. A contemporary engineering account describing the construction methods, steel tunnel sections, railroad ferry operations, and underwater assembly.
https://www.scientificamerican.com/article/the-detroit-river-tunnel-1907-12-21/
Historical Photographs & Attribution
Historical photographs featured in the accompanying documentary were obtained from the Library of Congress, Prints & Photographs Division.
Railroad Tunnel and Construction:
Historic Detroit River Tunnel — https://www.loc.gov/item/2016815610/
Sinking the Last Tubular Section — https://www.loc.gov/item/2016815088/
Additional Tunnel Construction View — https://www.loc.gov/item/2016811309/
Historic Tunnel Approach — https://www.loc.gov/item/2016815378/
Historic Railroad Tunnel View — https://www.loc.gov/item/2016815613/
Railroad Ferries and Detroit River Shipping:
Railroad Ferry Transport — https://www.loc.gov/item/2016798385/
Railroad Transfer Steamer Detroit — https://www.loc.gov/item/2016813544/
Michigan Central Railroad Ferry in Ice — https://www.loc.gov/item/2016798383/
Detroit River Freighter and Marine Mailboat — https://www.loc.gov/item/2016795295/
These archival photographs are presented for historical and educational purposes. Individual Library of Congress catalog records provide information about each image's source and applicable rights or restrictions.
Documentary & Production Disclosures
Original Footage: Contemporary Detroit River video was filmed by Detroit River Live while traveling along the Detroit waterfront toward the Ambassador Bridge.
Historical Imagery: Archival photographs illustrate the transportation and engineering history discussed. Not every photograph depicts the precise location or event described in the narration.
Tunnel Map: The explanatory location graphic shows an approximate tunnel corridor and is not intended to represent a surveyed engineering alignment.
AI-Assisted Production: Research organization, script development, and editing received AI assistance. Narration was generated using the creator's authorized ElevenLabs voice clone. Editorial and publication decisions remain with Detroit River Live.
Historical Accuracy: Information was compiled from historical publications, institutional records, and archival materials. Every effort has been made to distinguish documented historical facts from approximate descriptions and illustrative imagery.
© 2026 Detroit River Live / RSKissel Media. Original video footage and production. Historical photographs remain subject to their respective rights and attribution requirements.