The 36th Street Portal is a SEPTA Subway-Surface Lines trolley station. Just off the corner of 36th and Market Streets, it is at this station that the 10 trolley of the Subway-Surface Lines goes into the tunnel after running on the street in West Philadelphia coming from the Overbrook section of Philadelphia. Trolleys run in the tunnel from this station to Center City Philadelphia. At 33rd Street, the 10 trolley connects with the other Subway-Surface Lines which come into the tunnel at 40th Street. After entering the tunnel, the 10 trolley runs under Market Street to Center City Philadelphia. The station itself is above above ground right before the tunnel. It is about a block and a half walk away from the Sansom Commons/36th Street station where one may connect to the other trolley lines in their tunnel without having to go to the 33rd Street station.