Hopes of averting fresh travel chaos on London Underground have risen after one of the unions involved in a row over ticket office closures suspended a planned strike.
Sources said that the TSSA union was going to suspend a walkout from 9pm tonight after reaching a deal during talks which ended at the conciliation service Acas today.
The move is expected to be confirmed later today.
The RMT union is also involved in the dispute, with its members due to take industrial action following a strike last week which crippled Tube services in the capital.
An Acas spokesman said: "Talks have adjourned at Acas this morning. London Underground will be writing to the trade unions with some proposals to end this dispute.
"We are hopeful of a positive response so that the proposed industrial action will be withdrawn."
Workers were due to strike for 48 hours in protest at controversial plans to close all Tube ticket offices, with the loss of 950 jobs.
A 48-hour stoppage last week caused travel chaos in the capital.
The Federation of Small Businesses (FSB) estimated that last week's action cost small firms in the capital £600 million in lost working hours, business and productivity.