Mr Cash had been elected after Bob Crow died suddenly in 2014.
Mr Lynch said: “I am greatly honoured to have been elected by the RMT’s members as general secretary.
“I will maximise the unity of our great organisation, bringing together every sector and grade to build our union’s membership, influence and power. We will grow our union in every workplace as a strong and dynamic force.
“Our message to the employers and the politicians is that RMT stands ready to campaign and fight against pay freezes, cuts to safety and conditions.
“We call on the rest of the Labour movement to stand strong and mobilise against any new age of austerity which makes working people pay for the Covid crisis.”
Assistant general secretary Mick Lynch elected as new RMT chief
warringtonguardian.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from warringtonguardian.co.uk Daily Mail and Mail on Sunday newspapers.
Assistant general secretary Mick Lynch elected as new RMT chief
sthelensstar.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from sthelensstar.co.uk Daily Mail and Mail on Sunday newspapers.
Assistant general secretary Mick Lynch elected as new RMT chief
thetelegraphandargus.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from thetelegraphandargus.co.uk Daily Mail and Mail on Sunday newspapers.
Assistant general secretary Mick Lynch elected as new RMT chief
leaderlive.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from leaderlive.co.uk Daily Mail and Mail on Sunday newspapers.