Rail union RMT has rescheduled a strike calling off a three-day walkout from December 22 to replace it with a 48-hour stoppage from December 19.
The strike, surrounding a bitter dispute over changes to the role of guards, changed the date of the walkout following consultation with passengers and members.
RMT general secretary Mick Cash said: "It is from that daily feedback from passengers that the union has taken the decision to alter the dates for action over Christmas. That's the difference between us and Southern. We listen, they don't."
Strikes scheduled for December 6 to 8 and from New Year's Eve to January 2 remain in place.
Commuters angry at the strike affecting Southern rail services have clashed with members of the Rail, Maritime and Transport (RMT) union, who's strike has led to five days of reduced train service.
The confrontation took place outside Victoria Station in London, after one disgruntled passenger complained that the cancellation of 40% of trains meant that people "cannot get to work on time".
Talks aimed at averting a 48-hour strike by workers on First Great Western from Wednesday evening have broken down, said the RMT rail union.
- Background: Unions suspend planned Bank Holiday strike
Talks to avert a rail strike have resumed today.
Members of the Rail, Maritime and Transport (RMT) union at Network Rail are due to walk out for 24 hours from next Thursday evening and 48 hours the following week, threatening travel chaos after a new pay offer was rejected.
- Read more: Rail workers to strike next month
Mick Cash has been elected as the new head of the Rail, Maritime and Transport union (RMT), succeeding Bob Crow.
The 54-year-old beat four rivals in a ballot to become the new general secretary.
Mr Cash, who has been a member of the RMT and its predecessor National Union of Railwaymen for 35 years, stood in as acting general secretary after Mr Crow died in March.
The London Underground and Rail, Maritime and Transport are holding last-ditch talks just hours before a three day strike, that could affect millions of people across London and surrounding areas.
Conciliation service Acas said the talks between the RMT and London Underground started at 10am.
RMT union members are set to walk out of their jobs for three days at 9pm this evening, in a long-running dispute with the London Underground over ticket office closures.
A two-day strike last week caused huge disruption, with roads clogged as people switched to other forms of transport.
A rail company is to take legal action against a trade union over a dispute which is disrupting its services.
Members of the Rail Maritime and Transport union (RMT) at East Midlands Trains were banned overtime a week ago, leading to timetable changes and cancellations this weekend.
The union said there had been a breakdown in industrial relations over a number of issues, including the scheduling of work in Nottingham.
Planned strikes by ScotRail workers on Saturday and Christmas Eve have been called off, the RMT union has announced.
Cleaners on London Underground will launch a 48-hour strike today in a dispute over an Olympic bonus payment.
Members of the Rail Maritime and Transport union employed by private contractors will walk out at 5.30am, with picket lines outside stations including Stratford, close to the Olympic Park.
RMT general secretary Bob Crow said:
"With the eyes of the world on the London Olympics the many millions enjoying the events around the globe must not forget the London transport cleaners on minimum pay rates doing some of the dirtiest jobs in often appalling conditions with no Olympics recognition and reward whatsoever."