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Because I don´t have mFX+ locos I cannot write anything about those features.¨

When I saw that Märklin is going to publish new book about CS2 and it´s features I decided to wait for that before I continue writing.

Re: ... page 3, under picture 2
When activated BR94 start run three seconds in speed of 53 ( at the moment I don’t excatly know what that 53 stands for)

Below is from the help file "hilfe/de/fsitem_speed.html" translated using google ...

In summary the CS2 uses a 0-1000 scale for its internal speed range - this is divided into increments based on the decoders definition of # of steps.
Possibly the easiest way to conceive this is as a percentage divided by 10 - thus 53 = 5.3% of maximum speed

This is rather an over simplification as ...
- the speed curve set into the decoders of modern locomotives is rarely linear
- for a given decoder speed step (say 14 on a 28 step decoder) the scope within the 1000 range could be from approx 482 to 512 )
however it does give a starting reference.
- the magic around a 27 step decoder interpreting a 1-14 command range depends on acceleration v deceleration.

I have my reservation about the calculation shown
I suggest you would be better to learn the speed by driving the loco the way you want and noting the values anyway.

FWIW, on the normal CS2 throttle control page, the FS (Fahstufen) value shown next to the green speed bar max's out a "-1" (1 less) than the specified decoder. i.e. for an mfx 126 step decoder it is 125 and for an old MM 14 step decoder it is 13.

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Change engine run command

Loco
Selection of the loco to be controlled
Speed
desired speed of the locomotive in parts per thousand (1: 1000) of the maximum speed of the locomotive
0 = stopping the locomotive with ABV
1 = locomotive runs at the lowest possible gear
100 = train reaches 10% of full speed
500 = train reaches 50% of full speed
750 = train reaches 75% of full speed
1000 = train reaches full speed
Waiting period
The pause after this step run (real-time hh: mm: ss.ss)

If you want to calculate the (per 1000) value for an appropriate gear (decoder spreed step) , the following formula is used:
- Rate (per thousand) = 1+ (increment * ( desired_speed_step -1))

The step size is obtained from the number of speed steps, supported by the decoder:
14 speed steps
increment = 77
27 speed steps
increment = 38
28 speed steps
increment = 37
31 speed steps
increment = 33
126 speed steps
increment = 8
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