Thursday’s strikes involve members of the RMT union at fourteen train operators, TSSA members at seven corporations and Unite members at Network Rail.
Meanwhile, on Friday each the London Underground and Overground are littered with RMT strike action, during a separate dispute over pensions and pay.
Transport for London (TfL) says individuals ought to avoid the Tube, which can have very little or no services running, and solely use the remainder of the network if essential.
Some bus services also will be affected as drivers participate during a strike known as by the Unite union.
The summer of train disruption continues.
Today is that the begin of 4 days of reduced services during a row, as a result of strike day disruption spills over into later-starting trains ensuing day.