sentences:  The preservationist group Isle of Man Steam Railway Supporters' Association have campaigned for their completion, especially in conjunction with a potential commuter train services between Port Erin, Castletown and Douglas, which would extend the service that is laid on annually by the railway in connection with the T.T..The TT Commuter service is currently run using a steam locomotive and hauled stock, which leads to high operating costs.A shift in management attitude could see their return to service in the future, but for the time being, they remain in store at Douglas station awaiting completion and return to service.