Within walking distance of Pike's Market in Seattle, the Symphony Station stop on the 1 Line Light Rail is part of the Downtown Seattle Transit Tunnel, about 60 to 70 feet below ground. It is named such being next door to Benaroya Hall, the home of the Seattle Symphony.
The entrances to the subway system in downtown Seattle are (unintentionally?) hidden. Google will get you to the right corner, but the entrance/exit is specifically in one place. In this case, it's the SouthWest corner of the building, so had to walk around until I found signs for it...even then, it's just not as easy to find as other stations in more transit-intensive cities.
You need to choose which train you want to take, before going down the appropriate set of stairs. Once on the platform, one would notice the extreme amount of space between the tracks going in opposite direction, and the lack of height from the platform and the tracks. The gap between the tracks is wide enough to handle 3 or more lanes of cars...so I wondered "That's a lot of work to dig just to allow repair vehicles to come down".
Later I learned the history behind it. The Downtown Seattle Transit Tunnel was initially built (dug) to handle transit buses, serving that purpose from 1990 to 2005, and then shared by light rail and buses from 2005 to 2019. During that time, it was one of only two tunnels shared by both buses and trains in the U.S. Now it is just for Light Rail, with the large bus lanes being a remnant of the past. read more