Thousands of workers and pensioners marched through London this weekend for retirement with dignity: The "Pay Up for Pensions" rally - organised by the TUC - called for a decent retirement for all and a new pensions partnership. Research by the union shows that low-income workers have been hit hardest by cutbacks in work-based pensions. A third fewer of those earning under £200 a week now have any pension compared to six years ago, it said. Scotland Yard estimated 3,000 people took part in the march through central London, but organisers said the number was closer to 10,000. Meanwhile, Britain braces for the first national rail strike in a decade: The left-led Rail, Maritime and Transport union yesterday announced that it had scheduled 24-hour stoppages beginning at 6.30pm next Tuesday. The strikes were condemned by employers, passengers' groups and the government. Signallers, station staff and maintenance workers at Network Rail are in dispute with the infrastructure company over plans to close its final salary pension scheme. Network Rail said the strike would inevitably cause "major disruption", despite contingency plans to use more than 200 retrained senior executives to keep signal boxes open. A simultaneous stoppage on London's tube system will take place as part of an RMT campaign to secure a four-day working week. The underground carries 3 million passengers a day - more than all of the country's overground trains put together.