The rail union is planning a 150-person picket of the terminal for two days next week.
The new government was determined to avoid a return to the old days of industrial action and mass picket lines.
Most union members were reluctant to cross the picket line.
stand on/walk the picket line We spent two weeks walking the picket line, trying to get better benefits.
Workers staged a picket outside the factory gates.
Workers picked up their picket signs and began their protest.