The Michigan Central proposed the construction of a tunnel under the river with the support of their counterparts at the Great Western Railway. Construction started in 1871 and continued until ventilating equipment failed the next year; work was soon abandoned. Attention turned in 1873 to the alternative of building a railroad bridge over the river. The U.S. Army Corps of Engineers commissioned a study of a bridge over the Detroit River. Representatives of the shipping industry on the Great Lakes opposed any bridge with piers in the river as a hazard to navigation. Discussions continued for the remainder of the decade to no avail; a bridge over the Detroit River was not approved. The U.S. Congress requested a new study for a bridge in 1889, but no bridge was approved. Finally, the Michigan Central built the Detroit River Tunnel in 1909–10 to carry trains under the river. This tunnel benefited the Michigan Central and Great Western railroads, but the Canada Southern Railway and other lines still preferred a bridge over the river. Plans for a bridge were revived in 1919 to commemorate the end of World War I and to honor the "youth of Canada and the United States who served in the Great War".