Large Scale Central

RailPro LM-3S-G vs 4S

Was getting ready to order a couple more modules and saw that there is a 3S and 4S. Assuming the 4 is a newer version but some dealers list the 3S. So what is the “real” difference and is it something I need to worry about?

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From what I saw on the RailPro website the -3 is for HO and the -4 is forG scale/gauge/size locomotives.

I got mine from RLD Hobbies , Robby is easy to email or call , just asked for him to get me what I would need to convert whatever locomotive I’m working on.

The 4S is the newer board that supports triggering for proper chuff in Steam locos. The G on the end of the model number means G scale.