DCC CV's - Best Practices for N&W Steam

[NW Mailing List]

Hi,

More or less none of those cv settings have universal values, and most are
going to be specific to the locomotive.

The speed curves depend on your preference and also decoder type. I
recommend the default, non linear responses drive me nuts, but that's your
call.

Speed matching is just pick your best and smoothest runner and use it as
the benchmark. I would not bother trying for scale MPH limited by the
decoder. The trim/matching is set by experimenting. TCS has a match
feature, which you just follow they verbal instruction it gives you to set
that up. Otherwise it's a very tedious process.

Your question about consisting should be more general about if and how
lights and sounds were matched by locomotives that ran together?

David Baker


On Tue, Jan 14, 2025, 1:27 PM NW Mailing List <nw-mailing-list at nwhs.org>
wrote:

> Steam Modelers;
> It’s been a long time since I’ve seen any messages from the NW-*Modeling*-List
> leaving me to wonder if it has fallen into disuse. So, I’ll post here on
> the NW-*Mailing*-List.
>
> I am initiating the task of programming the CV’s of a small number of N&W
> Steamers in classes A, J, K, S1, Y3, & Y6b and many questions are coming to
> mind. So, why not tap into the best data source for guidance? As you share
> information, please indicate the Locomotive Class.
>
> Beginning with some foundational matters:
>
> My goal is to keep things *reasonably* realistic. For example; The Y
> classes were not speed-demons, and the K classes had operational speed
> limits due to counterbalance issues.
>
> When dealing with acceleration and deceleration rates – I’m rather torn
> about actually putting hard values in CV’s because I would say they should
> be dependent on external conditions such as train power and weight, in
> addition to terrain.
>
> Have you pursued speed limitations? Initial research suggested these top
> speeds for Road Power:
>               Class A – 70 mph
>               Class J – 110 mph
>               Class K – 35 mph
>               Class Y – 50 mph
>
> What are you using for:
>               CV 02 – Start Voltage
>               CV 03 – Acceleration Rate
>               CV 04 - Deceleration Rate
>               CV 05 – High Voltage (Speed Limiting)
>               CV 06 – Mid Voltage
>               CV 65 – Kick Start
>
> Speed Curves:
>               Which are you using?
>                            3-point curve? (Start, Mid, High of a preloaded
> curve)
>                                          CV 25 - Speed Table Selection?
>  Which one?
>                            14 step or 28 step configured?
>                                           What do you have for CV 67 to CV
> 94?
>                            Are you using a Throttle Control Mode?  If so,
> which one?
>
> Speed Matching & Consisting:
>               If it is Speed Matched, to what locomotive?
> What values do you use for:
>                            CV 66 – Forward Trim
>                            CV 95 – Reverse Trim
> What values do you use for consisting with other Locomotives:
>                             CV 21 – Consist Functions Fn1 to Fn8
>                             CV 22 – Consist Functions Fn0 & Fn9 to Fn12
>                             CV 23 – Consist Acceleration Rate
>                             CV 24 - Consist Deceleration Rate
>
> Thank you,
> Dave Willis
> Blt 1962, CN 4
>
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