Tube commuters warned of "another pointless strike"
Transport for London was warning commuters in the capital of "another pointless strike" on the Tube on Tuesday, after Picadilly line drivers voted to walk out over what they described as "bullying, harassment and intimidation" from managers.
The Rail and Maritime Transport Union said it was a "comprehensive breakdown in industrial relations", over problems with the fleet of trains on the line - London's fourth busiest.
Tensions began rising in January, when a door opened on a moving train as it approached Heathrow. An inspection of the entire fleet of Picadilly line trains - dating from the 1970s - followed, with TfL saying it was an isolated incident.
The RMT disagreed, saying its drivers were seriously concerned about the state of the trains.
"There are major problems with the rolling stock that are not being addressed," a spokesman told the BBC.
"Despite the fact that we've got members in the depot working to try to keep the fleet going, we've got problems with doors opening between stations, wheel flats and signals being passed at danger," he added.
General secretary of the union Pat Cash said management were using the issues as a tool to harass and threaten its members through disciplinary action, leaving drivers in a "vulnerable position".
Operations director for London Underground, Pat Hansberry, called the strike action "pointless" and disappointing, and urged the RMT to continue talks.
No date was set down for the strike at the time it was announced.