Summary: Muni riders whose travel includes trips through the Twin Peaks Tunnel will be forced to find alternative routes. Signs posted at Muni stations alert riders about the tunnel closure and suggest alternate modes of transportation. Passengers ride through the Twin Peaks Tunnel on an L train after leaving West Portal Station. Muni trains will not run through the Twin Peaks Tunnel for two months during work to replace rails and their supporting structure inside the 100-year-old tube.
