Volume 2 - Act 5
Wise owls guide was great again, this is just my version.. Simple enough.
On the right you find a carousel, Unlock it.
Press B to have Sonya go over, you move over to the left hand side of where the entrance is but STAY CROUCHED!
BEFORE you press B and have Sonya turn it on, look at the guard at the back right by the train station doors.. There are two sets of doors to go into, on the left and on the right..
To get all 3 guards distracted, MAKE SURE the one guard is by the RIGHT side of doors and then press B, if he is at the left side, he willl not hear it thus making it harder for yourself.. Still doable, but harder.
Anyway, once all 3 are distracted, just go to the main entrance (Big set of doors) quickly piclock it and voila!