The former "Seacat Isle of Man" is to return to Manx routes, after an overhaul and under its new name, Sea Express 1.
Its going to take over the routes run by the SuperSeacat 2 which has been running at reduced speed after the removal of one of its gearboxes for repairs.
The Steam Packet says it means the normal fast craft schedule can be resumed from September 11th.
Its thought the SuperSeacat could be in dry dock for some time.
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