Real "Titanic" fans know that the ill fated ship was the largest and best appointed ship in the White Star fleet.

What some people don't know is that Titanic was one of three sisters...

There was RMS Brittanic and...

RMS Olympic.

Olympic's hull is almost completed and Titanic's is en route (just started) next to it in this photo... Thanks to Lost Liners for the image...

...and for the record, the oldest sister was Olympic!

Interestingly enough, Brittanic was lost also before her time... she struck a mine in WWI while acting as a hospital ship and sank with the loss of thirty lives. The loss of life would have been far worse, but thankfully, she had no patients on board when she went down.

Olympic had an interesting claim to fame as the only "civilian ship" (she was acting as a troop transport,) to sink a U-Boat when she rammed U-103. Her war service of transporting more than 200,000 soldiers earned her the nickname of Old Reliable... kind of shocking when you think of what happened to her middle sister, Titanic!

After the war, Olympic resumed acting as a transatlantic liner until the bottom fell out of the trade and in 1934, she was retired from service in favour of newer more economical vessels.

In 1935, the breaking up of Olympic was started... by 1937, even her hull was scrapped... and this ended the "Olympic-Class" liners...

Olympic, Titanic, and Brittanic.

Of note, Brittanic might have been destined to be "Gigantic"... but White Star changed their minds. Some period print-ads (before their launch) list "Brittanic" as "Gigantic"... but who know what might have been...

The "death tolls" of the three sisters are...

Olympic: 1 (someone jumped overboard on one cruise.)

Titanic: 1,496 (collision with iceberg) and 1 man was crushed to death on her launching...

Brittanic: 30 (on hitting the mine)

SOURCES:
Wikipedia
Titanic and her Sisters
Lost Liners