YARRA Trams ticket inspectors could soon stop issuing fines, refuse to carry out plain-clothes duties, and provide passengers with ''free travel days'', as part of an industrial campaign for better pay and conditions.

The Rail, Tram and Bus Union has asked its members, which include drivers and ticket inspectors, to vote on strike action against Yarra Trams, run by a joint venture of French transport giant Keolis and Australian engineers Downer EDI.

The proposed strike action could include four-hour strikes which would throw the network into disarray. Credit:Joe Armao

Yarra Trams employees' three-year employment contract expired at the end of June, and the union is now negotiating with management for a new agreement.

The operator has put forward an option for some driving staff to work 10-hour shifts for four days a week - something the union argues is not safe because of fatigue. Yarra Trams management says it is safe, and will guarantee those who take up the offer three days off per week.