I would if I could Keith but well outside my part of ship knowledge I'm afraid.
I thought some kind of info might be available from HMS Belfast but all I've come up with just seems to be of no assistance whatsoever, see:-
HMS Belfast - forward engine room throttles
These are the main controls for the port outer engine that developed 20,000 horsepower. The three horizontal wheels are the throttles that let steam into the various turbines. The black wheel on the right is the main forward throttle. The red wheel in the middle is the astern throttle. The black wheel on the left is the cruising turbine throttle. The cruising turbine generates a lower power at higher efficiency for cruising at a lower speed than is required for going into battle. A set of black rods interlock the ahead and cruising throttles so that the two can't be opened at the same time.
HMS Belfast is a very special ship and is well worth a visit while much of the vessel is accessible to visitors
Source; geograph.org.uk