 During major construction works at Pankow station and in the north–south tunnel between September 2005 and May 2006, the S86 operated between Nordbahnhof and Birkenwerder to maintain a service to the outer railway ring stations.The line joined with the (S26) at Nordbahnhof for 3 weeks to provide a through service to Teltow Stadt from 8 May 2006 until 27 May 2006.The possible travel connections are correct for the period of operation and do not reflect the current travel connections for these stations.