- 3 updates
London Underground's operational development and upgrades director, Nigel Holness, said he was disappointed at the threat of industrial action over new trains.
He said good progress had been made in talks with the RMT on Wednesday and a further meeting was planned today.
On the Piccadilly line ballot, Phil O'Hare, LU's Piccadilly line manager, said he was hopeful the issues with the RMT could be resolved.
He said there had been two "very positive meetings" with the union, and management was "due to meet with the union's regional organiser next week to finalise an agreement".
RMT general secretary Bob Crow said:
The RMT union has announced that Tube drivers on the Piccadilly Line will strike in a row over working conditions.
Tube cleaners and some engineers working for Transport for London will also walk out in separate disputes.
Drivers on Tube lines serving the Hammersmith and City, Metropolitan and Circle Lines voted for industrial action, short of a strike.