The vessel operated between Dublin, Holyhead and Cherbourg.

The Cartour Epsilon was delivered in 2011 to Sicilian ferry operator Caronte & Tourist.

In 2013, the Epsilon was chartered to Irish Ferries to expand their Dublin–Holyhead route, crossing the route twice a day from Tuesday to Saturday, opposite the Stena Superfast X, before running Dublin–Cherbourg from Saturday and returning to Dublin.

On 11 February 2016, Epsilon sustained damage to her cargo, after sailing into Storm Imogen[2] while en route from Cherbourg to Dublin.

Her charter ended on 4 December 2023, the ferry had already been sold to Unity Line.