The Great Norther Railroad Built a tunnel through Stevens Pass in Washington State. The Railroad discovered the exhaust from the steams engines caused problems in the tunnels. Because of this they used electric engines to pull the cars through. A dam was created in Tumwater Canyon on the Wenachee River. The water was sent through a pipeline down to a plant that generated electricity for the engines. In 1954 the railroad started using diesel engines and abandon the pipeline and power plant. This bridge was used for the pipeline to cross the river. It is now been converted into a footbridge that follows a trail of the old pipeline.