Cleaners on the East Coast Mainline struck on Monday of this week. The RMT union members are employed by ISS.
They are campaigning for the Living Wage, and for improvements to pensions and conditions.
Strikers and supporters staged protests in London and York.
Meanwhile GMB union members who clean iconic housing blocks in London’s richest borough began a two-day strike on the same day.
The cleaners, employed by OCS in Kensington & Chelsea, are demanding the London Living Wage of £8.55 an hour.
They are currently paid just £7.18 an hour.