London Underground workers were "solidly supporting" a strike which disrupted Tube services on Thursday.
Members of the Rail, Maritime and Transport (RMT) union on the Central line walked out for 24 hours at 9pm on Wednesday night in a row over the "displacement" of staff.
RMT general secretary Mick Cash said: "Pickets are out in force this morning and support for the action is absolutely solid in all depots.
"This action has been provoked by a pointless and aggressive approach by London Underground that is entirely cash-led and which was always going to spark an angry backlash.
"If LU are allowed to get away with this move on the Central line, they will start shunting drivers around at the drop of a hat regardless of the consequences. Our members will be sent out from pillar to post to plug gaps that are solely down to staffing shortages.
"With massive budget cuts in the pipeline at LU, this is a straw in the wind as to how the company expects to operate in the future."
The Waterloo and City line was expected to close because of the strike but LU said services were running until at least the morning peak.
LU said the strike was unnecessary.
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