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RailPro Specific Help & Discussion / Re: Where to buy RailPro
« Last post by sieggs1 on July 11, 2026, 10:56:21 AM »
Hey All,

Anyone buy any RailPro equipment lately? I am looking for more LM-3S-21 decoders but it seems like only RailPro is stocking them these days. I don't really want to pay full price.

Sieggs
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RailPro Specific Help & Discussion / Re: Outputs for smoke units
« Last post by loco_man4449@hotmail.com on July 10, 2026, 10:19:46 AM »
Thank you
13
RailPro Specific Help & Discussion / Re: Outputs for smoke units
« Last post by gregeusa on July 06, 2026, 05:01:39 PM »
The question you need to ask, what is the current limit on those outputs?

And you need to decide how you want to run the USAT smoke unit.

Depending on the configuration you can pull an amp with them... I doubt the RP module has that ability.
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Finished RailPro Installation Examples / MOVED: Outputs for smoke units
« Last post by G8B4Life on July 03, 2026, 04:34:51 AM »
This topic has been moved to RailPro Specific Help & Discussion.

https://rpug.pdc.ca/index.php?topic=1822.0
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RailPro Specific Help & Discussion / Outputs for smoke units
« Last post by loco_man4449@hotmail.com on July 02, 2026, 09:05:49 PM »
I will be doing my first Rail Pro install. This is in a USA trains GP40 using a LM-5S-G. Can anyone tell me if outputs 7 and 8 can be turned on and off? I know smoke units take a lot of juice and shorten runs using batteries. Most likely will very rarely if ever use smoke, but would like to configure anyway.

Thanks in advance
Tom
16
General Discussion / Sounds Stop Working
« Last post by rsmproductions on June 30, 2026, 06:49:33 PM »
I've had an issue recently where i'll be running an engine with the chuff and other sounds with no issue.  After awhile and especially it seems if I introduce another engine programmed in the same controller that the sounds stop functioning.  Not sure what might be causing this.  Anyone else had an issue like this?

Richard
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Finished RailPro Installation Examples / Re: Walthers 2026 SW1... LM-3S-21 too big...
« Last post by LVRR1856 on June 30, 2026, 05:56:37 PM »
They make small speakers with a Arched sound box you could mount up under the roof of the cab.

Streamlined Backshop has them ....

 [ You are not allowed to view attachments ]
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Finished RailPro Installation Examples / Re: Walthers 2026 SW1... LM-3S-21 too big...
« Last post by William Brillinger on June 30, 2026, 04:10:18 AM »
You might also consider removing the housing from the LM-3S-21
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Finished RailPro Installation Examples / Re: Walthers 2026 SW1... LM-3S-21 too big...
« Last post by cws on June 29, 2026, 07:55:56 PM »
Excellent suggestions, I'll do some homework and maybe give it a try.

Fortunately, I have a spare 3S!  off to eBay to find an iPhone 4 speaker...

thanks!

Carl
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Finished RailPro Installation Examples / Re: Walthers 2026 SW1... LM-3S-21 too big...
« Last post by faithie999 on June 29, 2026, 06:13:00 PM »
i have no experience with that loco, nor with the 3s-21, but given those provisos, could you try this:

1) save the 3s-21 for another project and purchase a 3S.
2) remove the printed circuit board and all the white connectors, identifying all the wires (track current, motor leads, lights, etc)
3) hard wire the 3S to all the wires that were previously connected to the now-removed circuit board
4) use the smallest speakers you can find (i've used iphone 4 speakers which are pretty thin)

if none of this is applicable to your model than feel free to ignore the advice!

good luck

Ken

ps--if you are still short on space in wedging in a 3S, you can remove the plastic housing (voiding the warranty) and wrap the module with Kapton tape which will provide electrical insulation.
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