Caption: CP 240 emerges from the Detroit River rail tunnel on a sunny Saturday afternoon. About 3 minutes earlier, an ETR local passed over the bridge in the background. One day I will get an over/under meet here between CP and ETR. The tunnel between Windsor and Detroit was built in 1910 by the Michigan Central Railroad and has gone through some major transformations, and different owners over the years. Today CP owns the tunnel and is the only railroad that uses it regularly, compared to a few decades ago when multiple railroads ran trains through it. The tunnel was enlarged in 1994 to accommodate excess height traffic, but still cannot handle large cubed double stack intermodal.