RMT union tube drivers walked out last night in the first part of a fresh wave of planned strike action.
The strike, which started at 9pm, lasted six hours, with drivers back in their cabins by this morning.
A Transport for London spokesman said very few passengers were affected by the walkout, with some delays taking place but all customers able to complete their journeys.
The action did not affect planned engineering works.
An RMT spokesman told City A.M. the walkout was well supported by its members and he expected it to “have an impact” on the underground network.
Three more strikes covering 27 June, 30 June and 1 July have also been announced by the RMT union, which could cause far more disruption to the system.
The dispute centres around the sacking of a union activist.