DB Regio to operate Berlin S-Bahn Ring concession from 2021 December 9, 2015 | Europe News The Senate of Berlin has selected S-Bahn Berlin, subsidiary of Deutsche Bahn (DB) Regio, as the preferred bidder to operate the Berlin S-Bahn Ring/South East group of lines for 15 years beginning 2021... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password