 The route runs parallel to the Columbia River 's bank , and the river is visible most of the way . In a few places , the tracks are carried on low trestles over the water . The line passes through the NRHP @-@ listed Downtown Historic District , and its westernmost section passes under the Astoria – Megler Bridge . To the east of the Maritime Museum , at 20th Street , it passes a former Spokane , Portland and Seattle Railway depot built in 1924 . The fare has always been $ 1 , with an all @-@ day pass available for $ 2 . Around 2006 , operation was extended east from 36th Street to 39th Street , making the line about 3 miles ( 5 km ) long . 
