Up to 70 jobs are under threat at Translink as the company makes changes to its bus engineering division in Belfast.
It's understood jobs may be lost at an engineering depot on Falls Road, west Belfast and at other depots in Duncrue and Great Victoria Street as Translink moves the engineering work from Belfast to local depots.
SDLP councillor Tim Attwood said Translink workers in his west Belfast constituency were "stunned" by the prospect of job losses.
"I would hope that equity and fairness is shown in how these job losses are handled.
"The workforce in the Falls Road is a mixed Catholic-Protestant one and has been an example of best practice in that respect."
Translink told the BBC it was consulting with officials from the trade union about the plan which would see staff involved "offered a combination of redeployment opportunities and a voluntary redundancy scheme".
It said staff had been informed about the proposals which the company said would enable the division to "operate with greater efficiency".
"These changes are to ensure that we continue to operate sustainably in today's challenging environment and to continue to provide good," a statement said.