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He, likely, mentioned uncovered (just fenced) transmissions between the prime mover and auxiliary machines inside a diesel room of the locomotives; and as well, cooling-fans at diesel- and electrohauler's cases.
First's rotation is related with diesel's krankshaft revolution (i.e. wether diesel is running or no)
The second's action is, obviously, related with water or oil temperature (just on/off or variable), or, like third's - is turned on/off manually.
As well, the fans can start rotating with speed, proportional to load, when the ED brakes are engaged, if they are designed to blow air thru the EDB's rheostats (as they are included at the common circuit with resistors, i.e. are supplied with the same electric power from exaltaed TM, consuming a part of DB-generated energy, so the cooling performance follows brake intensivity);
or can be automatically turned on at their low speed alongwith TM engaging, then switched to hi-speed at higher loads. Maybe, in modern systems there is continious speed variation - I don't know yet.
In fact, due to lack of animation's type variants, that was inherited from MSTS, the fan's rotation on our models, nowadays is linked to wheels, what is not prototypic.
It's need to add, that the cooling sections has blinds (shutters), that are animated now only for manual operation, as unused "mirrors" sub-objects.
We have a triple question so far:
-new animation types introduction needed: for DBR's, TM's, Manually-engaged types of cooling fans; and automatic/manually operated shutters.
-scripting for automatic cooling system's behavior (there are some parameters now, but advance is needed) and
-new cab-controls with two types of sound triggers (one-shot click and looped moan with start/stop pieces) for fans operation.
Yet, fan's control can be switchable between "off", "auto on/off" and "manual on".