RailPro > RailPro Specific Help & Discussion
LM-3S-21 Module compatibility with different manufacturers
Smoke:
We can add Bowser to the list of locomotive manufacturers that are truly plug and play with the LM-3S-21.
The locomotives that I have personally tested and are plug and play with the LM-3S-21 are:
Athearn Genesis (MP15AC and SD60E)
Rapido (B36-7)
Bowser (SD30C-ECO)
I have been working with Tim (G8B4Life) on seeing if we can get a Scaletrains locomotive to work without any modifications and so far, no luck. We can get partial light outputs from the Ax functions, but not fully bright lights. I reached out to Scaletrains to see if they had any additional information but all I got back from support was "ESU is the only decoder that works". I did not receive a reply to my follow-up email where I included a bunch more information I have gathered.
LVRR1856:
Great Smoke ! I Just bought a RS-3 LVRR Hammerhead, in DC/DCC ready .... going to RP it up soon.
Good to know they play well together. Did you have to change the lights out ?
Smoke:
I did not change out the lights, they worked without any modifications with the LM-3S-21. The model I tested had an ESU V5 decoder so I pulled that out, replaced it with the LM and everything worked. Took a few minutes to figure out which lights went to what Ax outputs, but that's it.
sieggs1:
Hey All,
I just installed my RailPro system in an Athearn RTR SW1500 switcher locomotive. Damn, it's tight in there! I shoe-horned the LM-3S-21 module onto the factory motherboard and also installed a speaker with some modification to the chassis.
Has anyone installed a LM-3S-21 but removed the factory motherboard to save space? I assume there are resistors on the motherboard for the LEDs so by removing it I would have to install my own resistors? Is there anything else I would lose?
Just wondering if anyone has removed the factory motherboard or if that is a practical solution.
Thanks,
Rob S.
snowdog:
I have removed the casing of the LM3S-21 to get it to fit in an Athearn Roundhouse GP40-2..
Warranty voided but it fit...and works!
--- Quote from: sieggs1 on August 14, 2025, 03:28:09 AM ---Hey All,
Just wondering if anyone has removed the factory motherboard or if that is a practical solution.
Thanks,
Rob S.
--- End quote ---
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