Rail workers’ union RMT has announced more strikes next month following what it said was a pay offer “U-turn” from Network Rail.

Three days of strike action are set to take place on 3, 5 and 7 November.

Negotiations had been under way between the union and the rail operator.

The RMT said there had been an agreement that Network Rail would commit to an improved offer on pay and work towards a negotiated settlement but the company “reneged on their promises of an improved pay offer and sought to impose job cuts, more unsocial hours and detrimental changes to rosters”.

The strikes are taking place as the rail company “attempted to impose drastic changes in working practices”.

The union said Network Rail wrote directly to staff to undermine talks and have tried to rehash a previously rejected deal.

RMT staff will also strike on 3 November in a separate dispute with London Underground and Overground networks (Arriva Rail London).

RMT General Secretary Mick Lynch said: “On the one hand they (Network Rail) were telling our negotiators that they were prepared to do a deal, while planning to torpedo negotiations by imposing unacceptable changes to our members’ terms and conditions.

“Our members are livid with these duplicitous tactics, and they will now respond in kind with sustained strike action.”

The latest announcement follows months of strike action from the union as they seek to halt redundancies and improve pay and conditions.

Network Rail has been contacted for comment.