London, UK. 25th April, 2018. Members and supporters of the Rail, Maritime and Transport (RMT) union take part in a national protest outside Parliament to mark the second anniversary of its dispute with Southern Railway regarding the role of guards on trains. RMT members have taken industrial action throughout that period following the introduction of driver-only operation with guards as ‘on-board supervisors’. Credit: Mark Kerrison/Alamy Live News Stock Photo