 FACT: It is stated in the movie that the Titanic was the fastest  liner in the world, and that she was traveling at 26 1/2 knots near  the beginning of the voyage. The Titanic could only travel at 23  knots, and she never traveled at her top speed before her sinking.  Besides this, the RMS Mauretania was capable of 27 knots, so 26 1/2  wouldnt have been enough to beat her.