Tube passengers endured further travel misery today, with severe delays on three Underground lines.
The hold-ups, which included part-suspension of services on two lines, followed a series of problems on the Tube last week.
Today's difficulties were due to signal failures at West Ham and at Temple.
The failures led to a part-suspension of the Hammersmith & City and District lines between Liverpool Street and Barking and severe delays on the rest of the two lines as well as severe delays on the Circle line.
These people aren't happy:
The Circle and District lines were among the routes affected by problems on the Underground last week during the first hot spell of weather of the year.
Several hundred passengers had to be led through a tunnel on Wednesday night after a Jubilee Line train broke down. Those involved in the incident are to be paid £40 each in compensation.
Last Tuesday morning, as many as six Tube lines were hit by delays during one period of the rush-hour.
The delays prompted the RMT union, which has complained of cut-backs in staff, to call for an inquiry into the running of the Underground.
These calls were repeated today. The union's leader Bob Crow says: "The chaos of last week has spilled over into this week despite the barrage of lies and excuses from London Mayor Boris Johnson and his officials."