What are the names of the two ocean liner sister ships of the RMS ‘Titanic’, also built in Belfast, Ireland?

The ‘Titanic’ was an ocean liner ship along with its two sisters ships, the RMS (Royal Mail Ship) ‘Olympic’ and the HMHS (His Majesty’s Hospital Ship) ‘Britannic’. All three ships were built in Belfast, Ireland at the Harland & Wolff shipyard.

The RMS ‘Titanic’ was a British passenger liner operated by the White Star Line. It sank in the North Atlantic Ocean on April 15, 1912, after striking an iceberg during her maiden voyage from Southampton, UK, to New York City, New York, USA.

The RMS ‘Olympic was also a British ocean liner that had a long career spanning 24 years from 1911 to 1935 including service as a troopship during the First World War (1914-1918), gaining her the nickname ‘Old Reliable’. Capacity as a passenger ship was 2,435 with a crew of 950. ‘Olympic’ was withdrawn from service and sold for scrap in 1935 with demolition completed in 1937.

The other sister ship called the ‘Britannic’ never operated in her intended role as a passenger ship. Instead she served as a hospital ship during the First World War until she sank near the Greek island of Kea, in the Aegean Sea in 1916. It was the third vessel of the White Star Line’s class of steamships. The ship was launched just before the start of the First World War and was the safest of the three ships with design changes made during construction, due to lessons learned from the sinking of the ‘Titanic’.

For the other options listed, SS, stands for Steam Ship and HMS stands for His or Her Majesty’s Ship.