Exact locations of the boiler rooms and the engine room

Looking at the Encyclopedia Titanica blueprints, it seems like the boilers are on the Orlop Deck and the Engine and Turbine room is on the Tank Top Deck. However, I was told the boiler rooms and the engine and turbine room are all on the Tank Top Deck. Who is right, or am I just reading the blueprints wrong? And if ET is correct, how must one get from the boiler room, down one deck, to the Engine or Turbine room?
 
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