After more than a month of chaos and dashed expectations, Southern Cross Station's out-of-action escalator was moving again on Wednesday afternoon.

The escalator, one of three servicing platforms nine and 10 at the Collins Street end of the station, has been out of action since early April when a major component broke down.

The newly repaired escalator to platform nine and 10 at Southern Cross Station. Credit:Yan Zhuang

It caused peak-hour delays for frustrated commuters on the Hurstbridge, Mernda, Belgrave, Lilydale, Alamein and Glen Waverley lines.

The repairs are taking so long because an escalator part needed to be made in Europe.