The ''''
(44 & 45 Vict. c. cc) authorised that company not only to have a railway built between Holywood and Bangor but also to run steamships "for the purpose of establishing an improved and efficient communication between Belfast, Holywood and Bangor"''. The did not exercise this power, but several years after it had been taken over by the , the latter company started running scheduled passenger steamship services on the route. The took advice from the
Glasgow and South Western Railway (G&SWR), which had been running passenger
paddle steamers since 1891. For the 1893 season the had ordered a new ship, , to be built by
J&G Thomson at
Clydebank. The two railways then ordered from Thomson's two
sister ships of a slightly revised design: for the and for the . Thomson's launched
Slieve Donard on 20 May 1893 and she entered service between Belfast's Donegall Quay and Bangor on 20 June. She was named after
Slieve Donard, the highest peak in the
Mourne Mountains in County Down. In October 1893 the ordered a slightly larger paddle steamer, , named after
Slieve Bearnagh, the second-highest peak in the Mourne Mountains. She made her first voyage on Belfast Lough on 1 May 1894.
Donard and
Bearnagh worked between Donegall Quay and Bangor, between them providing six sailings per day from Mondays to Saturdays and five on Sundays. From Mondays to Saturdays one mid-afternoon sailing per day extended around the coast to
Donaghadee. On Saturday afternoons other sailings continued from Bangor across Belfast Lough to
Larne. Later that summer a local steamer line, the
New Belfast, Bangor and Larne Steamboat Company, went into liquidation and the bought two of its ships, and , from the receivers. These ships were older and smaller than those that Thomson had supplied, and the seemed to have made little use of them.
Bangor Castle had been on charter to the
Southampton, Isle of Wight and South of England Royal Mail Steam Packet Company since 1888 and was scrapped in 1899. In 1899 the railway sold
Slieve Donard to Alexander Campbell, co-founder of the
P & A Campbell pleasure steamer company.
Slieve Bearnagh remained with the , occasionally making excursions to
Portaferry on the
Ards Peninsula,
Ardglass in south Down, and Larne and
Portrush on the coast of
County Antrim in addition to her regular scheduled route on
Belfast Lough. At the end of the 1911 summer season the put
Slieve Bearnagh up for sale and ordered a new paddle steamer, again slightly larger than her predecessors.
A & J Inglis of Pointhouse,
Glasgow launched the new ship,
PS ''Erin's Isle, on 12 June 1912 and fitted her out in less than a month. On 19 June 1912 the railway sold Slieve Bearnagh
to D&J Nicol of Dundee for service on the east coast of Scotland. Erin's Isle'' was in service from 12 July 1912 until her fourth summer season ended on 29 September 1915. On 20 November 1915 the
Admiralty requisitioned her for £400 per month to be a
Royal Navy minesweeper. On 7 May 1919 she was sunk by a
mine, for which the Admiralty paid £53,676 compensation. However, the railway found that a new ship would cost £64,000 and decided not to return to owning steamships. ==Ulster Transport Authority==