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Twin Ferry for Arran, Firth of Clyde Begins Shipbuilder Sea Trials

14th November 2026
The second new-build ferry, Glen Rosa, is due to be handed over to CMAL in February 2027 before entering service on the Arran service across the Firth of Clyde.
The second new-build ferry, Glen Rosa, is due to be handed over to CMAL in February 2027 before entering service on the Arran service across the Firth of Clyde. Credit: Ferguson Marine-Linkedin

CalMac’s considerably long-awaited and over-budget new ferry MV Glen Rosa has begun shipbuilder trials on the Firth of Clyde, marking a “pivotal moment” in its path towards joining the company network.

The much-delayed, 102-metre-long ferry is to undergo rigorous specialist testing of the propulsion and power-generation systems. In addition to its automation, monitor safety, and navigation under real sailing conditions.

Upon completion of the trials, any necessary technical refinements will be addressed by its shipbuilder, Ferguson Marine, Port Glasgow, before the ferry enters the final build and evaluation phase.

 The Scottish Transport Secretary Stephen Flynn said the delay would allow for the installation of new propellers and the Liquefied Natural Gas (LNG) fuel system to be filled. Such a measure would prevent the need to recall the twin funnelled ferry at a later date.

It was confirmed in October that the delivery handover date for the Glen Rosa has been pushed back until February next year, joining twin Glen Sannox, which entered service more than six years late on the Ardrossan-Brodick, Arran route. 

Once these works are completed, Glen Rosa will undergo owner’s sea trials with Caledonian Maritime Assets Limited (CMAL) and be followed by CalMac.

STV News has more on the delayed newbuid's entry.

Published in Shipyards
Jehan Ashmore

About The Author

Jehan Ashmore

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Jehan Ashmore is a marine correspondent, researcher and photographer, specialising in Irish ports, shipping and the ferry sector serving the UK and directly to mainland Europe. Jehan also occasionally writes a column, 'Maritime' Dalkey for the (Dalkey Community Council Newsletter) in addition to contributing to UK marine periodicals. 

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Shipyards

Afloat will be focusing on news and developments of shipyards with newbuilds taking shape on either slipways and building halls.

The common practice of shipbuilding using modular construction, requires several yards make specific block sections that are towed to a single designated yard and joined together to complete the ship before been launched or floated out.

In addition, outfitting quays is where internal work on electrical and passenger facilities is installed (or upgraded if the ship is already in service). This work may involve newbuilds towed to another specialist yard, before the newbuild is completed as a new ship or of the same class, designed from the shipyard 'in-house' or from a naval architect consultancy. Shipyards also carry out repair and maintenance, overhaul, refit, survey, and conversion, for example, the addition or removal of cabins within a superstructure. All this requires ships to enter graving /dry-docks or floating drydocks, to enable access to the entire vessel out of the water.

Asides from shipbuilding, marine engineering projects such as offshore installations take place and others have diversified in the construction of offshore renewable projects, from wind-turbines and related tower structures. When ships are decommissioned and need to be disposed of, some yards have recycling facilities to segregate materials, though other vessels are run ashore, i.e. 'beached' and broken up there on site. The scrapped metal can be sold and made into other items.