With her sister ship TSS Mellifont she provided a passenger and freight service between Drogheda and Liverpool as a replacement for the paddle steamers Tredagh and Kathleen Mavourneen. In 1912 the other ex-Drogheda Steam Packet Company paddlers, Iverna and Norah Creina, were also withdrawn from service.
Passenger service between Drogheda and Liverpool was discontinued in 1914, but the Colleen Bawn continued on the route in freight service. She passed into the hands of the London & North Western Railway in 1922 and the London, Midland & Scottish Railway in 1923. The LMS passed the Drogheda-Liverpool route to the British & Irish Steam Packet Company in 1928, and the Colleen Bawn was moved to the freight service between Holyhead and Greenore. She was scrapped in 1931.[3]