Rail workers in the RMT union protested in central London on Monday of this week over a lockout of a group of safety workers.
The workers are employed by the STM agency on a Transport for London funded contract for London Overground.
The RMT says STM has locked workers out, without pay, for taking industrial action against bullying.
Northern Rail staff vote for walkouts
Workers at Northern Rail have voted by 58 percent for strikes to defend jobs and conditions.
The RMT union members are fighting management attacks on permanent jobs with negotiated pay and conditions. Strike dates have not been called yet.
Strike ballot makes Branson back down
Richard Branson, owner of Virgin trains, has been forced to back down over the introduction of new uniforms for staff with cheap see-through blouses.
The RMT was preparing to ballot for strikes when Branson backed down.
Drivers’ action to defend conditions
London Underground train drivers were set to begin indefinite industrial action short of a strike from Wednesday of this week.
The action affects drivers at depots serving the Hammersmith and City, Metropolitan and Circle lines.
It is over changes to agreed terms and conditions.