(21 May 2014, 5:56 am)aureolin wrote More info here - http://www.rmt.org.uk/news/rmt-calls-ind...ear-metro/
I'd hope no bus drivers would take up the overtime to cover strikers. Secondary action is of course illegal, but there's more often than not, no obligation for compulsory overtime. If customers are the priority then DB should make a proper effort to resolve the dispute instead.
Details of extra buses along the Metro lines here.