Bus and tram passengers have been warned that toilets and ticket offices at some stations will remain closed for four days due to industrial action.
Transport for Greater Manchester (TfGM) said facilities at transport interchanges would be affected by the strike, which runs up to and including Thursday.
It said tram and bus services would not be affected, however, since neither drivers nor conductors were involved.
TfGM said passengers could still buy passes or tickets at interchanges in Altrincham, Bury and Manchester’s Shudehill.