Troon Harbour played a notable part in the development of the town for many years. It was home to the Ailsa Shipbuilding Company, which constructed many vessels for worldwide customers but mainly small passenger and various merchant vessels. The fishing fleet from Ayr moved to Troon Harbour and a revitalisation of the abandoned section of the harbour started. An approach road was constructed to connect to a P&O terminal which operates a service to Ireland. The Seacat high speed ferry service briefly operated from Troon Harbour but has now ended.