The RMT rail union has predicted a “surge in crime” across northern England if guards are axed from trains.
Northern Rail plans to end the guarantee of guards on half of all its passenger services.
RMT, which has held a series of strikes on the service within two months, warns that the disappearance of guards will increase rail crime and anti-social behaviour and lead to “systematic discrimination” against disabled passengers.
The union issued the warning highlighting parliamentary answers showing that 333 of the 527 stations that Northern serves are unstaffed.
And a company briefing to employees admitted that only certain routes would retain a second person on the train.
RMT general secretary Mick Cash said: “Removing staff from trains, which will travel through over 300 unstaffed stations, is a toxic combination that will increase anti-social behaviour and and unleash a surge in crime.”