The timetable for electing a successor to RMT union leader Bob Crow has been announced, with voting set to be held in the summer.
Mr Crow, who increased membership of the organisation by more than 20,000 during his time as general secretary, died suddenly last month.
A spokesperson said nominations will be open from April 10 to July 2, with voting starting on July 21 and ending on September 22.
Acting general secretary Mick Cash announced that he will be standing for the post.
The 54-year-old previously worked alongside Mr Crow for 12 years as the union’s senior assistant general secretary.
Mr Cash has been a member of the RMT for more than 35 years and has undertaken a wide range of lay and full-time roles.
He immediately issued a warning to transport bosses that he was determined to step up the fight for job security and better pay and conditions.
Mr Cash added: “I will use all my leadership experience to make sure the RMT remains a militant, member-led union.”
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