Protest over cuts on trains.
Trains operated by Northern Rail between Newcastle and Sunderland will be halved from Sunday to allow the Metro service to be improved.
It will ease pressure on the line which is shared with the Metro.
And today members of the Rail Maritime and Transport Union were at Newcastle Central Station handing out leaflets to passengers.
The North East regional organiser Stan Herschel said he feared further cuts in services could be on the way.
"The Government's transport policy is in tatters," he said. "We are trying to raise awareness among the travelling public before it's too late.
"We would like them to contact their MPs and ask them to support our campaign."
A major shake-up in Metro timetables to improve services will take place on Sunday.
Information about the new Metro timetables are available by calling Traveline on 0870 608 2 608.