London Underground is cutting 1,000 jobs while Transport for London could slash 3,000 jobs. Neither company has ruled out compulsory redundancies.
Both also want to rip up an agreement signed with the RMT and Aslef unions in 2001 guaranteeing no compulsory redundancies.
London Underground offered workers a five-year pay deal, which would mean a 1 percent rise this year followed by the RPI measure of inflation plus 0.5 percent for the next four years. This would mean a pay cut in real terms.
Management offered the union a two-year deal in talks two weeks ago.
Management has intensified its use of attendance and disciplinary procedures against workers.
Workers and union reps have received harsh punishments.