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So what is "RealDrive"?
Throttle-dependant sound: The engine revs/chuff intensity follow the throttle, unless the locomotive is at the target speed, in which case the revs/chuff intensity reverts to that appropriate for the speed.the locomotive is actually running at. An example for a diesel locomotive is that under hard acceleration (throttle set from, say, 0 to >20 in one go) is that the engine sound will rev up to maximum and when the locomotive reaches the target speed will be heard to spool down, if necessary, to the level appropriate for the actual speed.
True coasting - a "first" on any sound decoder: When the throttle is reduced, including when it is set to 0, the locomotive will continue to run for a long period. However , the revs will spool down immediately for a diesel-electric project and for a diesel-mechanical project where the prototype has a free-wheel device. For steam projects the chuffs will not be heard, instead, the appropriate coasting sound will be heard. An example for a Heljan class 26 is that when closing the throttle from full speed the locomotive will run for around a scale mile (whilst idling) before eventually coming to a stand.
True braking - again another "first" on any sound decoder: Because of the true coasting feature, it is necessary to actually apply the brake (via function button) to bring the locomotive to a controlled stop. Without the brake, it would be impossible to control where the locomotive will come to rest.
Notch down and up using the throttle: A further benefit of "RealDrive" is that, once on the move,it is possible to notch down/up just using the throttle with little change to the actual locomotive speed.
RealDrive gives a driving experience that is much closer to the real thing!
We have tried to illustrate the prototypical driving experience in this short video: