The Titanic Mod brings people at one of the most detailed and accurate free 3D recreations of the Titanic ever made. It puts the player in a whole new storyline for the game Mafia.
"Why have the engines stopped? I felt a shudder?"
It would require a massive amount of force in order to flip the reversing gear of Titanic's engines. A high pressure cilinder, otherwise known as the reversing engine would operate the main engine's excentrics in order to invert the steam flow within the pistons.
You would expect that this tremendous force would shake the ship as seen within Cameron's film. But that seems very unlikely, as by the time the ship would enter or leave a port, you'd have to reassemble the whole engine because all the bolts sprung loose.
Have a glimpse of the level of detail the whole engine will be modelled in.
Interesting trivia, within the film, one of the most dramatic scenes (and my favorite) is where the ship reverses in order to avoid the iceberg. In reality, not only would it take too long for the ship to effectively reverse within the very limited time, a ship is actually only maneuverable when thrust is applied on the rudder. Had the Titanic actually reversed its engines, her turning radius would have dramatically increased due to the lack of forward thrust on the rudder. So even if they could instantly reverse the engines, the officers still wouldn't have done so in order to maintain maneuverability.