	The outer port shaft was driven by a high-pressure turbine that exhausted into a medium pressure turbine driving the outer starboard shaft. The two middle shafts, capable of reversal, were each driven by a low-pressure turbine, which in emergencies could each be driven by exhaust from the high-pressure turbine. Each shaft drove a four-bladed bronze propeller for a designed sea speed of 19 knots. Steam was provided by six double-ended and four single-ended forced draft boilers divided between two boiler rooms. On trials in the Clyde "Calgarian" attained 21.25 knots and on a double run for contract speed made 20.63 knots, a knot and a half above required service speed.