One the ship drivers here could give you a better answer but that would depend on the available power when the command was recieved. Would depend on how much steam could be supplied.hello there .......i'm wondering what actually the speed of titanic also the rpm here :
DEAD SLOW AHEAD
HALF SPEED AHEAD
FULL SPEED AHEAD
DEAD SLOW ASTERN
HALF SPEED ASTERN
FULL SPEED ASTERN
With thanks>>