Cleaners on the East Coast Main Line are planning to strike for 24 hours in a dispute over pay.
ISS workers voted 98 per cent in favour of industrial action September 10 after arguing that bosses had refused to offer employees a pay rise for the last three years.
RMT general secretary Bob Crow said: “ISS boasts on its website about how fairly it treats its workers, but behind the corporate claims is the sordid reality of effective pay cuts being imposed year-on-year on cleaners already on rock-bottom rates.
“ISS should be ashamed, but East Coast and London Midland also have a moral responsibility to ensure that the people who work on their contracts area treated decently, and it is no good hiding behind the shabby excuse that cleaners’ pay is a matter for the contractors.”