Hopes of a major breakthrough in the rail dispute have been shattered after Network Rail workers rejected a pay offer.

Members of the Rail, Maritime and Transport union (RMT) will now press ahead with two 48-hour strikes at Network Rail – and 14 train companies – from Tuesday and Friday.

The RMT said 63.6% voted to reject Network Rail’s offer on an 83% turnout.

General secretary Mick Lynch said: “This is a huge rejection of Network Rail’s substandard offer and shows that our members are determined to take further strike action in pursuit of a negotiated settlement.

“The Government is refusing to lift a finger to prevent these strikes and it is clear they want to make effective strike action illegal in Britain.

“We will resist that and our members, along with the entire trade union movement, will continue their campaign for a square deal for workers, decent pay increases and good working conditions.”

Trains will run from 7.30am to 6.30pm on this week’s strike days, although many parts of the country will have no services, including most of Scotland and Wales.

A strike by members of Unite at Network Rail will not go ahead after they voted to accept the offer.

Network Rail had offered a 5% pay rise for this year – backdated to January – with another 4% at the start of 2023 and a guarantee of no compulsory job losses until January 2025.

The RMT’s executive recommended rejecting the offer, saying it was linked to “significant” changes to working practices.

RMT workers at Network Rail will also strike from 6pm on Christmas Eve until 6am on December 27.

Passengers planning to travel on Christmas Eve will likely be urged to complete their journeys by the time industrial action begins.