DUMBARTON S rail services could be set to see major disruption as ScotRail engineering staff ready themselves for strike action. The national Union of Rail, Maritime and Transport Workers (RMT) confirmed that strike action over the issue of “equality between grades in payments for rest day working” will go ahead on Sunday, May 2 as planned. Earlier this month ticket examiners voted in favour of walkouts over the dispute and May 2 marks the first of their six weeks of action. This weekend was due to be the last of six Sundays of strikes by conductors but, from May 9, these workers will begin another six Sundays of action.