RailPro > RailPro Specific Help & Discussion

Installing a “Keep Alive” or similar circuit

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Lackawanna810:
Can anyone tell me which “Keep Alive” or similar circuit can be installed with the LM-3?

Thanks in advance for the due diligence.

nodcc4me:
The RailPro PBM2 was designed for keep-alive purposes.


https://www.ringengineering.com/PBM.htm

CPRail:
Alternatively, you can connect any of the TCS Keep-Alive units to the blue wire on the 9 pin side (blue wire on KA), and the yellow wire on the 6 pin side (black-white wire on the KA). Bill did up a nice diagram on this and you can find it here:
https://www.pdc.ca/ShopSuey/app/vendor/jQuery-File-Upload/server/php/uploads/Wiring%20Diagram%20for%20LM-3%20to%20TCS%20Keep-Alive.pdf

I don't believe this is "officially" sanctioned by Ring, but it works. I know there have been past discussion on how the PBM-2 is better, but when space is tight, you can still connect a TCS KA.

ON28:
Until I switched to PBMs I used the TCS keepalives and I agree with RailPro godfather, Lee Nicholas, who told me, "They don't really work."

Lackawanna810:
In reading the PBM manual, it says that it can only be used with HO scale locomotives. I model in S scale. I guess this means the PBM is out.

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