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Offline garben  
#1 Posted : 27 September 2025 12:29:47(UTC)
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garben

United States   
Joined: 23/01/2013(UTC)
Posts: 165
Location: New York
Hello,

I’m speed profiling trains for Train Controller (TC) and in setting up the loc, both the acceleration and deceleration delay should be set to 0 or 1. However, I believe this prevents the squealing brake sound. I know the sound works because I do get it before I make that change to the deceleration delay to 0 or 1. But I think if I keep a high decoration delay on the train then my calibrating will be off and TC wont stop the trains where I expect them to stop.

Wondering if anyone had any experience with this.

Thank you.
Norbert
Marklin HO, CS3+, Train Controller 10 Gold, Any era. Like Swiss Locomotives.
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Offline pederbc  
#2 Posted : 27 September 2025 15:25:10(UTC)
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pederbc

Sweden   
Joined: 11/06/2007(UTC)
Posts: 215
Location: Eslöv, Sweden
Hi,

The profiling has only to do with the speed. Brake profiling you have to do as described in the manual by trial and error. But you are right, to get brake squeeling you have to have a bit of ”brake setting” in the CV.

I always use end senors in blocks (3 sensors total) to make the stop more precise. The brake profiling will often differ depending on the load.


Fall greetings, Peder
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Offline garben  
#3 Posted : 27 September 2025 17:35:20(UTC)
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garben

United States   
Joined: 23/01/2013(UTC)
Posts: 165
Location: New York
Originally Posted by: pederbc Go to Quoted Post
Hi,

The profiling has only to do with the speed. Brake profiling you have to do as described in the manual by trial and error. But you are right, to get brake squeeling you have to have a bit of ”brake setting” in the CV.

I always use end senors in blocks (3 sensors total) to make the stop more precise. The brake profiling will often differ depending on the load.


Fall greetings, Peder


Thanks Peder. Leads to a question, if I profiled the train for speed, must I profile it again if I adjust the brake setting on the loc? In other words if I adjust the braking delay or acceleration delay on the loc must I re-do the speed profiling, run it through the process?
Marklin HO, CS3+, Train Controller 10 Gold, Any era. Like Swiss Locomotives.
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Offline JohnjeanB  
#4 Posted : 27 September 2025 18:31:25(UTC)
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JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 3,643
Location: Paris, France
Hi Norbert
squealing sound on decoders depends on many things (based on my Märklin experience)

Squealing sound parameters
- a minimum speed must be reached before breaking CV 64 Bremsenquietschen Schwelle niveau of squealing sounds (0 - 255)
- the duration of squealing sounds (Bandbreite Bremsschwelle) CV 164 is a duration in 0.1 second increments Usual value is 5
- the correction level (Korrekturfaktor Auslauf) CV 163, common value is 2 (to adjust the start earlier or later)

Activating squealing sounds with a control software (Rocrail in my case)
- don't use the s/w to make a speed / location control but rather use decoders with ineretial simulation (mSD3 in my case) as the multiple speed commands send to the loco may lock the squealing sounds)
- I use blocks with 2, 3 or 4 sensors to trigger speed changes when appraoching a red signal

At the start of this video, you may see how multiple speed controls stop the squealing sounds
Here because of the positioning of the loco for uncoupling


Cheers
Jean
My layout videos
latest vid
marshalling yard
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Offline garben  
#5 Posted : 27 September 2025 22:11:22(UTC)
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garben

United States   
Joined: 23/01/2013(UTC)
Posts: 165
Location: New York
Originally Posted by: JohnjeanB Go to Quoted Post
Hi Norbert
squealing sound on decoders depends on many things (based on my Märklin experience)

Squealing sound parameters
- a minimum speed must be reached before breaking CV 64 Bremsenquietschen Schwelle niveau of squealing sounds (0 - 255)
- the duration of squealing sounds (Bandbreite Bremsschwelle) CV 164 is a duration in 0.1 second increments Usual value is 5
- the correction level (Korrekturfaktor Auslauf) CV 163, common value is 2 (to adjust the start earlier or later)

Activating squealing sounds with a control software (Rocrail in my case)
- don't use the s/w to make a speed / location control but rather use decoders with ineretial simulation (mSD3 in my case) as the multiple speed commands send to the loco may lock the squealing sounds)
- I use blocks with 2, 3 or 4 sensors to trigger speed changes when appraoching a red signal

At the start of this video, you may see how multiple speed controls stop the squealing sounds
Here because of the positioning of the loco for uncoupling


Cheers
Jean


Hi Jean. I've been playing around with setting the acceleration and deceleration delays on the locomotive to see if I could get the brake squeal to work when running in Train Controller. These are my findings:
1) Changing the acceleration and deceleration values on a loc do not have any bearing on how my locomotive performs within Train controller. Once the loc's speed is profiled it does stop where it needs to etc. However, I do not get any squeal sound. Regardless if I run manually or automatically with TC, I do not get any squeal.
2) When I run the train using my CS3, I get the brake squeal.

I don't really understand what you mean by:[/i][/b]
- don't use the s/w to make a speed / location control but rather use decoders with ineretial simulation (mSD3 in my case) as the multiple speed commands send to the loco may lock the squealing sounds)
but it sounds like this could be the issue.

Thanks.

Norbert
Marklin HO, CS3+, Train Controller 10 Gold, Any era. Like Swiss Locomotives.
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Offline JohnjeanB  
#6 Posted : 28 September 2025 00:40:58(UTC)
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JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 3,643
Location: Paris, France
Hi Norbert
What I mean is there are ways to use Rocrail and probably TC where the speed changes are controlled minutely by the s/w sending many speed corrections instead of sending one or two
This may be the change with a cs3 which waits intil you are finished with the changes to send an update to the loco.
I suspect, the avalanche of speed commands to the decoder, supresses the squealing sound.

With Rocrail these are triggered by BBT or by ticking the remote ineretia simulation (up to 10 speed commands to bring a loco to a prototical stop (mostly needed when using old simple decoders

Squealing sound generation has evolved significantly over the past 10 years (Märklin's system, mSD and mSD3 decoders)

Cheers
Jean
My layout videos
latest vid
marshalling yard
My Layout
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Offline pederbc  
#7 Posted : 28 September 2025 01:29:33(UTC)
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pederbc

Sweden   
Joined: 11/06/2007(UTC)
Posts: 215
Location: Eslöv, Sweden
Hi,

No, you don’t need to redo the speed profiling. TC works with virtual steps, 1000 steps. During the profiling it maps the corresponding decoder steps to the virtual steps. Try to set the max speed close to the max speed you want to use in mph or km/h.

Peder
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